A car was traveling on a straight road at a constant speed of 50 kilometers per hour. Over the next two minutes, the car came to travel 80 kilometers an hour. Which of the following is true?

Answers

Answer 1
What are the following options or choices for this question?
Answer 2

The acceleration of the car over the 2 minutes is 0.07 m/s².

Acceleration of the car

The acceleration of an object is the rate of change of velocity of the object with time.

Acceleration of the car over the 2 minutes

The acceleration of the car over the 2 minutes is calculated as follows;

a = Δv/t

a = (v - u) / t

where;

v is the final velocity = 80 km/h = 22.22 m/su is the initial velocity = 50 km/h = 13.89 m/st is the time of motion, = 2 mins = 120 s

a = (22.22 - 13.89) / 120

a = 0.07 m/s²

Thus, the acceleration of the car over the 2 minutes is 0.07 m/s².

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Related Questions

is there friction when an object stands still?​

Answers

Answer:

No

Explanation:

The gravitational force always acts opposite the direction of motion. Air resistance only acts on objects that are moving. The force of friction does not exist when an object is stationary. All objects experience a normal force.

btw pls mark as branliest! Thanks!

Explain how bats use ultrasound to catch a prey​

Answers

Answer:

Ultrasound is used by bats to navigate (move) and catch prey. Ultrasonic squeaks are produced by bats. These squeaks ponder prey and then return to the bat's ear. This provides bats with information about the location of prey, allowing them to catch it.

Explanation:

A skydiver jumps from an airplane that is moving at 50 meters per second at a height of 1,000 meters what describes the skydivers energy immediately after leaving the air plane

Answers

Answer:

11060M  Joules, where M is the mass of the diver in kg

Explanation:

Mass of the skydiver missing, we're assuming it's M.

It's total energy is the sum of the contribution of his kinetic energy (K)- since he's moving at 50 m/s, and it's potential energy (U), since he's subject to earth gravity.

Energy is the sum of the two, so [tex]E = K+U= \frac 12 M v^2 + Mgh = M (\frac 12 \cdot 50^2 + 9.81\cdot 1000) = M ( 1250 + 9810) = 11060\cdot M[/tex]

A 15-volt power supply is used to power a circuit with two resistors in series. The voltage drop across R1 is 5 volts. What is the voltage drop across R2?

5 volts

20 volts

10 volts

0 volts



A 10-volt power supply is used to power a circuit, producing a current of 2 A. If total resistance of circuit is doubled, how will this affect the circuit?

A. Voltage drop across each resistor will all double to match change in resistance

B. The current will change so that the voltage drop for a complete loop through the circuit becomes 5 V.

C. The current will change so that the voltage drop for a complete loop through the current remains at 10 V.

D. The voltage drop across each resistor will be unaffected because each will remain at 0 V

Answers

(1) The voltage drop in the second resistor is 10 V.

(2) The voltage drop across each resistor will all double to match change in resistance.

The given parameters:

voltage in the circuit, V = 15 Vvoltage drop in first resistor, V1 = 5 V

The total voltage in a series circuit is given as;

[tex]V_T = IR_1 + IR_2\\\\V_T = V_1 + V_2[/tex]

The voltage drop in the second resistor is calculated as follows;

[tex]V_2 = V_T - V_1\\\\V_2 = 15 - 5\\\\V_2 = 10 \ V[/tex]

(2)

voltage supply, V = 10 Vcurrent, I = 2 A

The resistance of the circuit:

[tex]R = \frac{V}{I} = \frac{10}{2} = 5 \ ohms[/tex]

When the total resistance is doubled;

In series circuit, the current in each resistor is constant, the voltage drop is calculated as;

[tex]V = IR\\\\V = 2 (5+5)\\\\V = 20 \ V[/tex]

Thus, we can conclude that the voltage drop across each resistor will all double to match change in resistance.

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2. A roller coaster moves 85 m horizontally, then travels 45 m at an angle of
30.0° above the horizontal. What is its displacement from its starting
point? Use graphical techniques.

Answers

The displacement is 126m at 10.3 degrees above the horizontial (x-axis).

(Here you go sorry if this didn’t help)

3 points
A science teacher is going to make a Newton's Cradle using students on
swings. *
A
B C
Which of the following statements is true?

Answers

Answer:

When a ball on one end of the cradle is pulled away from the others and then released, it strikes the next ball in the cradle, which remains.

So it will be D

Explanation: Hope this helps :)

An athlete spins in a circle and throws a 1.6-kg discus. The radius of the discus's path is 1.0 m, and he releases it with an angular speed of 15.0 rad/s. The athlete spins for a total of 1.2 s before releasing the discus.
– What is the tangential speed of the discus at release?
– What is the centripetal acceleration of the discus?
– What is the centripetal force on the discus?

giving Brainliest for full and proper answers! thank you for anyone who tries to help/explain :)

Answers

(a) The tangential speed of the discus at the release is 15 m/s.

(b) The centripetal acceleration of the discus is 225 m/s².

(c) The centripetal force on the discus is 360 N.

The given parameters;

mass of the discus, m = 1.6 kgradius of the path, r = 1 mangular speed, ω = 15 rad/stime of motion, t = 1.2 s

The tangential speed of the discus at the release is calculated as follows;

[tex]v = \omega r\\\\v = 15 \ rad/s \ \times 1 \ m\\\\v = 15 \ m/s[/tex]

The centripetal acceleration of the discus is calculated as follows;

[tex]a_c = \frac{v^2}{r} \\\\a_c = \frac{15^2}{1} \\\\a _c = 225 \ m/s^2[/tex]

The centripetal force on the discus is calculated as follows;

[tex]F_c = ma_c\\\\F_c = 1.6 \times 225\\\\F_c = 360 \ N[/tex]

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a Name the store of energy when you are
pressing downwards on the stretchy skin
of the trampoline

Answers

Kinetic energy is stored when you are pressing downwards in a trampoline

Find a unit vector perpendicular to the vectors given A=4i+2j+2k and B=4i-4j+8k.

Answers

The cross product of A and B is perpendicular to both A and B.

A × B = (4i + 2j + 2k) × (4i - 4j + 8k)

A × B = 16 (i × i) - 16 (i × j) + 32 (i × k) + 8 (j × i) - 8 (j × j) + 16 (j × k) + 8 (k × i) - 8 (k × j) + 16 (k × k)

A × B = -16 (i × j) - 32 (k × i) - 8 (i × j) + 16 (j × k) + 8 (k × i) + 8 (j × k)

A × B = -16k - 32j - 8k + 16i + 8j + 8i

A × B = 24i - 24j - 24k

The magnitude of A × B is

||A × B|| = 24 ||i - j - k|| = 24√3

Dividing A × B by its magnitude gives a unit vector,

(A × B)/||A × B|| = 1/√3 (i - j - k)

Pythagoras theorem is used to find the resultant force when angle between 2 forces is _________ degrees. asap

0
45
90
180

Answers

[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪  {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]

Pythagoras theorem is used to find the resultant force when angle between 2 forces is 90 degrees ~

How do you find out the missing masses in a balloon

Answers

Answer:

How do you find out the missing masses in a balloon?

Well, actually you can't find the missing masses in a balloon. Why?

Because the mass of the mass of balloon, it can't see the mass of it, it only see if it the balloon is deflated or inflated.

Explanation:

Hope it helps

#LetsStudy

What is the net force needed to accelerate a 1 kg textbook with an acceleration of
4 m/s2

Answers

Answer:

4 N

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question

mass = 1 kg

acceleration = 4 m/s²

We have

force = 1 × 4 = 4

We have the final answer as

4 N

Hope this helps you

an amusement park ride has two identical carriages that revolve around the center of the ride’s axle, as shown in the figure. both carts travel at a constant tangential speed at all points along the circular path. at what position is the total mechanical energy of the cart-cart-earth system at its maximum value?

Answers

The principle of conservation of energy allows to find the result for the mechanical energy of the system is:

Mechanical energy is conserved at all points, therefore at all points it has the same value.

Mechanical energy is defined by the sum of the kinetic energy and the potential energies.

            Em = K + U

In the principle of energy conservation, it establishes that energy cannot be created or destroyed, it is only transformed, in the case of no friction, mechanized energy is conserved at all points.

They indicate that the system is rotating, which is why it is subjected to a force that expends its energy in changing the direction of the speed to keep the system in rotation, so the speed of the system remains constant.

          Em = K = ½ I w²

Consequently, using the principle of conservation of energy we can find the result for the mechanical energy of the system is:

Mechanical energy is conserved at all points, therefore at all points it has the same value.

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A medium-sized apple provides about 95.0 Calories of energy.

(a) Convert 95.0 Cal to joules.

(b) Suppose that amount of energy is transformed into kinetic energy of a 2.03 kg object initially at rest. Calculate the final speed of the object (in m/s).

(c) If that same amount of energy is added to 3.79 kg (about 1 gal) of water at 21.7°C, what is the water's final temperature (in °C)? The specific heat of water is

c = 4186

J

(kg · °C)

.

Answers

A. 95 Cal is equivalent to 397480 J

B. The final speed of the object is 625.78 m/s

C. The final temperature of the water is 46.8 °C

A. Converting 95 Cal to Joules

1 Cal = 4184 J

Therefore,

95 Cal = 95 × 4184

95 Cal = 397480 J

Thus, 95 Cal is equivalent to 397480 J

B. Determination of the speed of the object

Kinetic energy (KE) = 397480 J

Mass (m) = 2.03 Kg

Velocity (v) =?

KE = ½mv²

397480 = ½ × 2.03 × v²

397480 = 1.015 × v²

Divide both side by 1.015

v² = 397480 / 1.015

Take the square root of both side

v = √(397480 / 1.015)

v = 625.78 m/s

Therefore, the speed of the object is 625.78 m/s

C. Determination of the final temperature of the water

Mass of water (M) = 3.79 kg

Initial temperature of water (T₁) = 21.7 °C

Specific heat capacity of water (C) = 4186 J/KgºC

Heat (Q) = 397480 J

Final temperature (T₂) =?

Q = MC(T₂ – T₁)

397480 = 3.79 × 4186 (T₂ – 21.7)

397480 = 15864.94 (T₂ – 21.7)

Clear the bracket

397480 = 15864.94T₂ – 344269.198

Collect like terms

397480 + 344269.198 = 15864.94T₂

741749.198 = 15864.94T₂

Divide both side by 15864.94

T₂ = 741749.198 / 15864.94

T₂ = 46.8 °C

Therefore, the final temperature of the water is 46.8 °C

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helppppppp meeee please

Answers

Answer:

B.X substance = sulfur dioxide, Y substances = sodium carbonate

Explanation:

sorry for wrong because that is my predicted

NEED HELP!!! ANSWER THESE 5 QUESTIONS FOR 25 POINTS!!!! PLEASE ANSWER!! I WILL GIVE YOU BRAINEST

1. Jerome explains to his doctor that because he spends a lot of time at his desk, he makes sure that his chair supports good posture. But when he is home, he spends his time on an old, squishy couch that offers very little support. He figures that since he spends most of his time at work, he does not need to worry about his home furniture as much. How would Jerome’s doctor MOST likely reply?
A.
Jerome’s thinking is correct since he spends most of his time at work.
B.
Jerome should bring his chair from work home with him on the weekend.
C.
If Jerome’s standing posture is good, he does not have to worry about his seated posture.
D.
Sitting properly is important in all contexts, so Jerome should consider his seating at home.

2. Guillermo has decided that he wants to be healthier, so he starts jogging. He has been at it for a week, but he is getting frustrated because he cannot run very far without getting out of breath. He is beginning to think that this is not a good exercise for him since he is not very good at it. What BEST explains why Guillermo is struggling?
A.
He probably does not have good form when he is exercising.
B.
He likely has heart or lung problems that he was not aware of.
C.
He does not have much endurance since he is new to exercise.
D.
He is just not good at jogging and needs to try something else.

3. Which is the BEST example of the kind of mechanics that are studied in sports biometrics?
A.
the average attendance at a sporting event
B.
how a new sport becomes popular in a community
C.
the movement of the wrist when hitting a tennis ball
D.
the median height of the most successful hockey goalies

4. Ewan had a resting heart rate of about 110. What does this indicate?
A.
His heart rate is perfectly average.
B.
He probably has a high metabolism.
C.
He needs to work on raising his resting heart rate.
D.
His heart rate is high and could indicate a problem.

5. Why is acceptance an important part of building a healthy lifestyle?
A.
Exercise will probably not change much in your life.
B.
Healthy lifestyles often create a lot of disappointment.
C.
If you understand your limitations, you are less likely to be frustrated.
D.
Finding the energy to exercise can be hard, so you should limit your goals.

PLEASE NO LINKS

Answers

1. D
2. C
3. C
4. D
5. D
•••••••••••••••••••••••••••••••••••••••••••••••••
I really hope this helps! These answers are the most reasonable.

. A small toy car having 300 grams of mass and going straight with an initial velocity of 13 m/s. When the toy car collides with an obstacle, a resistive force of 4 N acts upon it. The speed of the toy car reduced and reached 8 m/s. Draw its free body diagram and then find the time for the toy car to be into rest position?

Answers

The free-body diagram is attached in the image below. The time for the toy car to be in rest position is 0.6 s

From the given information:

The mass of the toy car = 300 g = 0.3 kgThe initial velocity (u) of the car = 13 m/sThe resistive force F_r acting on the car = 4 NThe speed of the car (v) = 8 m/s

A force is regarded as a push that causes an alteration in motion of an object within a specified distance. It is usually expressed by the formula:

Force = mass × acceleration

acceleration = Force/massacceleration = (4 / 0.3) m/s²acceleration = 13.33 m/s²

Using the first equation of motion for the time to bring the car to rest from it reduced speed of 8 m/s;

v' = v + at

since the final speed to bring the car in rest position is (0), then:

0 = 8 -  13.33(t)

13.33(t) = 8

t = 8/13.33

t = 0.6 seconds

Learn more about the equation of motion here:

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the amount of force applied per given area is

Answers

Answer:

Explanation: The amount of force applied per given area is pressure...(F/A)

SI unit=Pascals(Newtons/m^2)

What is the power of a crane that lifts a 120 N load 14 m in 3.6 s?

Answers

Answer:

1000n

Explanation:

hop it helps

Answer:

467 watts

Explanation:

Power is = to work/time. Work is = to force (N) times distance from starting point. So first, calculate work. 120N x14m , which is equal to 1680 joules. so then plug it into your power formula. 1680 joules/ 3.6 seconds= 466.666...7, which rounds to 467 watts.

2. Why do you think a light stick would be a good light source around flammable material?

Answers

Answer:

because it doesnt contain fire

Look at the circuit below. What is the potential difference across lamp 2?

Answers

The potential difference across lamp #2 is 4.5 volts.

Make a
claim about whether a mixture could be made
up of only elements and no compounds.
Summarize evidence to support the claim and
explain your reasoning.

Answers

Answer:

Yes, a mixture can be made up of just elements and no compounds. The elements never experiance a chemical interaction and stay only in physical contact with each other.

BRAILIEST PLS I NEED LEVEL UP!

4. A net force of 15 N is exerted on a book to cause it to accelerate at a rate of 5 m/s2. Determine the mass of the
book.
a. 0.33 kg
b. 2 kg
c. 3 kg
d. 45 kg

Answers

Answer:

3 kg

Explanation:

The mass of an object given it's force and acceleration can be found by using the formula

[tex]m = \frac{f}{a} \\ [/tex]

f is the force

a is the acceleration

From the question we have

[tex]m = \frac{15}{5} = 3 \\ [/tex]

We have the final answer as

3 kg

Hope this helps you

the weight of a box having of 100 kg is __n

Answers

Answer:

mom                                                                                                

Explanation:

The symbols used in language have no direct relationship between the word and the object or idea.

Answers

Answer:

The symbols used in language have no direct relationship between the word and the object or idea. Underextension in language occurs when a child incorrectly uses one word to describe other objects or actions that are similar to that word. ... Morphemes are the smallest distinctive sound units in a language.

Explanation:

Answer:

True

Explanation:

e2021

name two possible ways in wivh fossils can be dated and define them

Answers

Answer:

There are two main methods determining a fossils age, relative dating and absolute dating. Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages.

Mark me with a crown

Answer: dna

Explanation:

sorry if this is wrong lol

look at picture, need to know net force, whether they are balanced or unbalanced and whether they are accelerated or not accelerated!

Answers

Answer:

1) 100 ...unb. and accelerate

2) 7...unb. and accelerate

The force of gravity between two students is 3.5E-8 Newtons. If
the first students mass is 71.0 kg and the second students mass is
67.0 kg, how far apart must the students be from each other?

Answers

Answer:

r = 9521.29

Explanation:

Given:

Gravitational Force = [tex]3.5E-8[/tex]  (Fg)

Student Mass 1 = 71 kg (M)

Student Mass 2 = 67kg (m)

Gravitational constant = [tex]6.67E-4[/tex]  (G)

[tex]Fg=\frac{GMm}{r^{2} }[/tex]

[tex]r^{2} =\frac{GMm}{Fg}[/tex]

[tex]r^{2} =\frac{(6.67E-4)*(71)*(67)}{3.5E-8}[/tex]

[tex]r= \sqrt{90654828.57}[/tex]

[tex]r=9521.282927[/tex]

r = 9521.29

calculate the mass fo an unknown solid if its density is 1.6 g/cm^3 and it has a length of 7.5 cm, a height of 12.5 cm, and a width of 2.2 cm

Answers

Answer:

Density = Mass / Volume

Mass = Density * volume = 1.6 gm/cm^3 * (7.5 * 12.5 * 2.2) cm^3

Mass = 1.6 gm/cm^3 * (206 cm^3) = 330 gm

Two objects feel 200 N of force due to gravity between them. If the mass of one object was doubled, what would be the new force of gravity?

Answers

Answer:

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