Answer:
(b) 2
Explanation:
Newton's first law states that objects do not change their velocity unless acted upon
by an outside force. When throwing a ball the ball initially accelerates from the force
provided by your arm and then begins to slow down.
What force(s) are responsible for the deceleration of the ball?
Answer:
Air resistance/Drag (this is the proper term for air resistance) or gravity or friction
It depends on the direction and if you throw it across a surface or if you throw it straight upwards.
I hope this helps!!
Answer:
Newton's first law: An object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force.
Explanation:
The diagram below show the alignment of the sun moon and earth
Which diagram shows an alignment in which spring tide takes place
A
B
C
D
Answer:
A
Explanation:
The image that shows an alignment of earth, moon and sun during spring tide is option A. All of them will be in a straight line.
What is spring tide ?A spring tide is a type of tide that occurs when the Earth, sun, and moon are aligned in a straight line. During a spring tide, the gravitational pull of the sun and the moon combine, resulting in higher-than-normal high tides and lower-than-normal low tides.
During a spring tide, the position of the sun, moon, and earth is aligned in a straight line. The gravitational force of the moon and sun both act upon the oceans of the Earth, creating a combined effect that results in unusually high tides.
During a spring tide, the moon is either new or full, which means it is in a position that aligns with the sun and Earth. The gravitational pull of the moon and sun reinforce each other, creating a stronger gravitational force on the Earth's oceans.
This causes the water level to rise higher than normal during high tide and lower than normal during low tide. Here, image A shows the correct alignment.
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Question 1 and 2 and 3 physics lesson homework
Answer:
Jackson 2: Smart 3: Ahmed
Explanation:
square + circle = egg
oops, wrong guy
How bones do humans have ??
Answer:
206
Explanation:
The axial skeleton, comprising the spine, chest and head, contains 80 bones. The appendicular skeleton, comprising the arms and legs, including the shoulder and pelvic girdles, contains 126 bones, bringing the total for the entire skeleton to 206 bones.
A fully grown adult features 26 bones in the spine, whereas a child can have 34.
Answer:
The human body is made up of 206 bones
5. A cable is attached 32.0 m from the base of a flagpole that is about to
be raised. The raising of the pole is temporarily halted when the pole is
at an angle of 60.0° with respect to the ground. If the cable exerts a ver-
tical force of 1.233 x 104 N downward and a horizontal force of 1.233 x
104 N to the left, what is the length of the flagpole?
Answer:
The length of the flagpole is approximately 87.43 m
Explanation:
The given parameters of the cable attached to the flagpole are;
The point along the flagpole at which the cable is attached = 32.0 m
The angle with respect to the ground at which the raising of the flagpole is halted = 60.0°
The downward force exerted by the cable, [tex]F_v[/tex] = 1.233 × 10⁴ N
The force exerted by the cable to the left = 1.233 × 10⁴ N
Let 'W' represent the weight of the flagpole, at equilibrium, we have;
The sum of vertical forces = 0
Therefore;
[tex]F_v[/tex] + W - R = 0
W - R = -1.233 × 10⁴ N
Taking moment about the support at the base of the pole, we get;
1.233 × 10⁴ × d × cos(60.0°) - 1.233 × 10⁴ ×d× sin(60.0°) + W × d/2 ×cos(60.0°) = 0
∴ W × d/2 ×cos(60.0°) ≈ 4513.093·d
W = 2 × 4513.093/(cos(60.0°)) ≈ 18,052.373 N
R = 18,052.373 + 1.233 × 10⁴ ≈ 30,382.373
R ≈ 30,382.373 N
Taking moment about the point of attachment of the cable to the ground, we have;
W × ((d/2) × cos(60.0°) + 32) = R × 32
∴ (d/2) = ((30,382.373 × 32/18,052.373) - 32)/(cos(60.0°)) ≈ 43.71281
d = 2 × 43.71281 ≈ 87.43
The length of the flagpole, d ≈ 87.43 m
The rhinestones in costume jewelry are glass with index of refraction 1.50. To make them more reflective, they are often coated with a layer of silicon monoxide of index of refraction 2.00. What is the minimum coating thickness needed to ensure that light of wavelength 527 nm and of perpendicular incidence will be reflected from the two surfaces of the coating with fully constructive interference
Answer:
t = 6.6 10⁻⁸ m
Explanation:
In this case we have that the reflection in the film is constructive, we take into account that
* When the light is reflected from the air (n = 1) to the film (n=2) it has a phase change of 180º
* within the film the wavelength is modulated by the index of refact
λₙ = λ₀ / n
taking into account these two aspects the expression for constructive interference is
2n t = (m + ½) λ₀
let's find the minimum thickness (t) of the film
t = (m + ½) λ₀ / 2n
for m = 0
t = ½ 527 10⁻⁹ /(2 2.00)
t = 6.6 10⁻⁸ m
Compare the concepts of mass and weight. Name three differences.
Answer:
1a)Mass is the amount of matter in the body.
1b)Weight is the measure of the amount of force acting on a mass due to acceleration and gravity.
2a)Mass can never be zero
2b)Weight can be zero if no gravity acts upon an object. like in space
3a) Mass does not change according to location.
3b)Weight varies according to location.
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Calculate the amount of heat needed to convert 0.8 kg of ice at -19 °C into water at 29 °C.
An object's speed is 0.8 m/s, and its momentum is 200 kg-m/s What is the mass of the object?
A. 250kg
B. 200kg
C.160kg
D.128kg
Answer:
A: The mass would be 250kg
Explanation:
In terms of an equation, the momentum of an object is equal to the mass of the object times the velocity of the object. where m is the mass and v is the velocity. The equation illustrates that momentum is directly proportional to an object's mass and directly proportional to the object's velocity.
p= mv
m= p/ v
The explanation to that is:
momentum = mass× velocity
mass= momentum / velocity
THE ANSWER IS A
Hope this helps!
Which two elements are the most abundant in the Earth's crust? A. silicon and oxygen B. silicon and magnesium C. iron and nickel D. iron and magnesium
Answer: A. silicon and oxygen
Explanation:
The two most abundance elements in earth's crust are silicon and oxygen.
The most abundant element in earth's crust is Oxygen (O) which has a percentage composition of 46.6%. Oxygen is mainly present as silicates, carbonates, sulphates etc.
The second most abundant element in earth's crust is Silicon (Si) which has a percentage composition of 27.7% . Silicon is present in the form of silicates.
The third most abundant element in earth's crust is aluminium (Al) which has a percentage composition of 8.1 %.
The fourth most abundant element in earth's crust is Iron (Fe) which has a percentage composition of 5.0 %.
Answer:
A
Explanation:
Determine la densidad de un objeto cuya masa es de 10 kg y tiene un volumen de 120 cm3
Answer:
dttydghcghcghdytdftygfvghxk,ghc
Explanation:
Which physical property is defined as the amount of space that matter occupies?
Answer:
The matter has mass and takes up space. The amount of space that matter takes up is called its : density
Answer:
Mass
Explanation:
Mass is the amount of matter occupied by an object.
What is the velocity of a wave with a frequency of 45 Hertz and a wavelength of 3 meters?
Explanation:
By using v=( f )x( lambda )
v= 45 s^-1 x 3 m
Therefore v = 135 ms^-1
A silver tea spoon is placed in a cup filled with hot tea. After some time, the exposed end of the spoon becomes hot even without a
direct contact with the liquid. This phenomenon can be explained by:
Answer:
As atoms in the spoon vibrates about their equilibrium positions and transfer energy form one end to other end. This process is called conduction.
10. How much total work do you do when you lift a 50 kg microwave 1.0 m off the ground and then push it 1.0 m
across a counter with a force of 50 N?
Work formula:
[tex]W = Fd\cos(\theta)[/tex]
F = 50N, d = 1.0 m
When you lift something straight up, the angle of the force is 90º
cos(90º) is 0, so there's no work done when you lift the microwave off the ground
[tex]W = (50N)(1.0)(0) = 0[/tex]
F = 50N, d = 1.0 m
When you push the microwave, the angle is 0º and cos(0º) is 1. So there is work done here:
[tex]W = (50 N)(1.0m)(1)[/tex]
[tex]W = 50[/tex]
total work = 50 joules
The gravitational force between two bodies is 250N . What will the new force be if one of the masses is tripled?
If one of the masses is tripled, then their product is tripled, and the force between them is tripled. The new force is 750N .
HELP YALL!!
Which nucleus completes the following equation?
Answer:
B
Explanation:
Chlorine institute
16+1=17
CI has 17 in the bottom.
Answer:C
Explanation:
5. In which image below is the most work being wasted as heat?
A. Image A
B. Image B
C. Image C
D. Image d
Answer:
C
Explanation:
The rock takes 8.16s to return to its release point. Given that the elastic band provides a speed of 40m/s to the rock in 10 cm stretch.
What will be the speed of the rock?Initial speed of the rock, u = 40m/s
Final position of the rock s = 0m taking the release point as reference. The rock takes 8.16s to return to its release point. Given that the elastic band provides a speed of 40m/s to the rock in 10 cm stretch.
Nuclear energy is a useful source of power but has disadvantages. The disadvantage of nuclear energy is it produces dangerous waste.
Initial speed of the rock, u = 40m/s
Final position of the rock s = 0m taking the release point as reference
From the second equation of motion:
solving above we get:
t = 0s or t = 8.16s, t =0 seconds is neglected since it represents the initial position which is the same as the final position at t = 8.16s
So, the rock takes 8.16 seconds to return to the release point.
Therefore, The rock takes 8.16s to return to its release point. Given that the elastic band provides a speed of 40m/s to the rock in 10 cm stretch.
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Suppose to a scientist was able to construct a barometer with a liquid being twice denser than mercury, then how would the liquid raise at standard pressure?
Answer:
h = h₀/2, the liquid column rises half the height
Explanation:
Pressure is defined as force per area,
P = F / A
in a barometer the force is the weights of the liquid column
F = W = mg
P = m g/A
if we use the definition of density
ρ = [tex]\frac{m}{A h}[/tex]
[tex]\frac{m}{A}[/tex] = ρ h
we substitute
P = ρ g h
Let's use the index o for the mercury
P₀ = ρ₀ g h₀
when we change the liquid for another with
ρ = 2ρ₀
the pressure expression is
P = 2ρ₀ g h
in the problem they indicate that the pressure is equal to the initial P = P₀
we substitute
ρ₀ g h₀ = 2ρ₀ g h
h₀ = 2h
h = h₀/2
the liquid column rises half the height
What should food workers do to prevent chemical hazards from contaminating food?
A. Wash their hands after taking out the garbage
B. Wear a hair net when working for food preparation areas
C. Store cleaning solutions and bottles away from food storage areas
D. Clean and San at is equipment and utensils for after hours of continuous use
In a ride in an amusement park, a carriage of mass 450 kg is travelling horizontally at a speed of 18 m/s. It passes through a shallow tank containing stationary water. The tank is of length 9.3 m. The carriage leaves the tank at a speed of 13 m/s. PT 3 a.) Calculate the change in kinetic energy of the cart while it passes through the water tank J (Hint: Change
Answer:
98.
Explanation:
divide
The change in the kinetic energy of the cart is equal to 34875 J.
What is kinetic energy?The energy which is possessed by a moving body because of its motion is known as kinetic energy. Work should be done in order to bring the change in the kinetic energy of a moving object.
The kinetic energy of a moving object can be determined from the formula mentioned below:
K.E. = ½mv² where ‘m’ and 'v' is the mass and velocity of the object.
Given, the mass of the carriage, m = 450 Kg
The speed of the carriage, u = 18 m/s
The initial kinetic energy of the cart = (1/2) × 450 × (18)²
(K.E.)₁ = 72900 J
The final speed of the cart, v = 13 m/s
The final kinetic energy of of the cart = (1/2) × 450 × (13)²
(K.E.)₂ = 38025 J
The change in the kinetic energy of the cart = (K.E.)₂ - (K.E.)₁
Change in the kinetic energy = 72900 - 38025 = 34875 J
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6. Calculate the pressure exerted on an elevator floor which has an
area of 6 m², if 20 people whose combined force is 1500 N are
standing on it.
Answer:
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what is vector product B×A of two vectors A=7i+4j-8k and B=3i-3j+5k
Answer:
[tex]4i+59j+33k[/tex]
Explanation:
Given that,
Vector A = 7i+4j-8k
vector B = 3i-3j+5k
We need to find B×A. It can be calculated as follows :
[tex]B\times A=(3i-3j+5k)\times (7i+4j-8k)\\\\=i (24 - 20) - j (-24 - 35) + k (12 + 21) \\\\=4i+59j+33k[/tex]
So, the value of vector product is [tex]4i+59j+33k[/tex].
Q7) A box sliding with a velocity of 5 m/s accelerates at 2 m/s^2. How
much is the box displacement after 6 s?
Answer:
The box displacement after 6 seconds is 66 meters.
Explanation:
Let suppose that velocity given in statement represents the initial velocity of the box and, likewise, the box accelerates at constant rate. Then, the displacement of the object ([tex]\Delta s[/tex]), in meters, can be determined by the following expression:
[tex]\Delta s = v_{o}\cdot t+\frac{1}{2}\cdot a\cdot t^{2}[/tex] (1)
Where:
[tex]v_{o}[/tex] - Initial velocity, in meters per second.
[tex]t[/tex] - Time, in seconds.
[tex]a[/tex] - Acceleration, in meters per square second.
If we know that [tex]v_{o} = 5\,\frac{m}{s}[/tex], [tex]t = 6\,s[/tex] and [tex]a = 2\,\frac{m}{s^{2}}[/tex], then the box displacement after 6 seconds is:
[tex]\Delta s = 66\,m[/tex]
The box displacement after 6 seconds is 66 meters.
To drive your car from Auburn to Atlanta (173.8 km) takes a significant amount of work. Assuming the force of friction between the tires and the road is 10290 N, how much work needed to drive that far? Express your answer in megajoules (MJ).
Answer:
1788.402 MJ
Explanation:
Work done = Force (N) x distance (m)
First we have to convert distance into metres:
173.8 x 1000 = 173,800 m
Then plug these values into the equation above:
173,800 x 10290 = 1788402000 J
The reason it's Joules (the unit for energy) is because work done = energy transferred
Now we have to convert Joules into Mega Joules:
1 J = 1/1000000 MJ
1788402000 J = 1788402000/ 1000000 = 1788.402 MJ
What sport was invented by the English?
Answer:Cricket !
The origins of cricket are very vague, and many theories have been put forward suggesting its origins, but it is, without doubt, very English. The first evidence of cricket being played was recorded in the year 1550, by the pupils of Royal Grammar School, Guildford.
Hope this helps ! ✨Don't scroll down. Help pls 22 POINTS!!
Answer:
I don't know if these are all right but these are my best answers. good luck and I hope you do well.
1. true
2. true
3. false
4. true
5. true
6. true
7. true
8. true
9. false
10. false
13. it stimulates the heart through chest compressions
14. on bare skin upper right shoulder and lower left ribs
15. no CPR
Explanation:
What kind of data does doppler radio provide
A. snowfall and freezing levels
B. temperature and atmospheric pressure
C. precipitation levels, cloud location, direction
D. flooding and tsunamis
Answer:
d
Explanation:
What does it take to change the direction or speed of an object
Answer:
An object's speed or direction can be changed by a force. This means a greater force against a lesser force, and it results in acceleration. This means any push or pull against another equal push or pull. It results in no change of acceleration
Explanation:
