What is the answer to this question?

Answer:

Soluble - salt

Insoluble - sand and stapler pins

Explanation:

The salt is soluble because it is an ionic solid which ready dissolves in water to form a solution.

The sand is insoluble because, it is a non-metallic solid which does not readily dissolve in water while, the stapler pin is insoluble because it is a metallic solid which does not readily dissolve in water.

Answer:

Explanation:

i. Accuracy in measurement is a term that is used to describe the closeness of a measured value to its actual value. It relates the actual value to the measured values.

Therefore in the given question, Amy's measurement of the salt's mass is accurate because her final value is close to all the measured values.

ii. Precision in measurement is a term that is used to describe the closeness of different measured values to each other. It relates the keenness in the measured values.

Thus, Amy's measurements of the salt's mass is precise because the values of the masses are close to one another.

Answer:

24 m/s²

Explanation:

The given parameters are;

The initial acceleration of the object, a = 16 m/s²

Let 'm' represent the initial mass of the object

The initial force acting on the object, F = m × a

∴ F = 16 × m = 16·m

When the mass is doubled, we have;

The new mass of the object, m₂ = 2 × m = 2·m

When the net force acting on the object triples, we have;

The new net force acting on the object, F₂ = 3 × F = 3 × 16·m = 48·m

From F = m × a, we have;

a = F/m

∴ The new acceleration of the object, a₂ = F₂/m₂

From which, by plugging in the values, we have;

a₂ = 48·m/(2·m) = 24

The new acceleration of the object, a₂ = 24 m/s².

Answer: D

Explanation:

Answer:

Force = mass x acceleration

Explanation:

According to the Newton's second law, the net force acting on the object is proportional to the rate of change of momentum of the body.

So, Force is given by

F = m a

where, F is the force, m is the mass and a is the acceleration.

when the mass is more, the acceleration is less as the force applied by the truck is same.

Answer:

242.4 V

Explanation:

Applying,

Q = cm(t₂-t₁)................ Equation 1

Where Q = amount of  heat, c = specific heat capacity, m = mass, t₁ = initial temperature, t₂ = final temperature.

But this heat is produced by electrical power

Therefore,

P = Q/t

Where P = Electrical power, t = time

Also,

P = V²/R

Where V = voltage, R = resistance

Therefore

V²/R = Q/t......................... Equation 2

Substitute equation 1 into equation 2

V²/R = cm(t₂-t₁)/t................. Equation 3

Given: R = 250 ohms, m = 4.6 kg, t₁ = 22°C, t₂ = 32°C, t = 15 min. = (15×60) = 900 seconds

Constant: c = 4600 J/kg.°C

Substitute these values into equation 2

V²/250 = 4600(4.6)(32-22)/900

V²/250 = 235.11

V² = 250×235.11

V² = 58777.78

V = √58777.78

V = 242.4 V

Answer:

The conservation of energy is a principle where according to which the energy of interacting bodies or particles in a closed system remains constant.

Explanation:

Answer:

a principle stating that energy cannot be created or destroyed, but can be altered from one form to another.

Answer:

Explanation:

Heredity is defined as the passage of genetic instructions from one generation to the next.

BLUEBLACK COLOR IS FORMED WHEN STARCH AND IODINE IS MIXED .

Answer:

True

Explanation:

because they can hold marine organism inside

Answer:

an open circuit (A battery, bulb, wire,switch)

Explanation:

the battery supplies the power the wire carries the current from the battery to the bulb but the circuit is not completed if the switch is not connected (Switch )

Answer:

mark me as the brainliest plss

Answer:

[tex]{ \tt{volume = \pi {r}^{2} h}}[/tex]

Answer:

All options presented were applied to the answer.

Explanation:

The sample response presented in the question above, refers to a closed system where two molecules after colliding satisfy the conservation of momentum law, which can also be called the conservation law of linear momentum. This law states that in a closed system the initial state of the components must be maintained and remain the same until the final state, that is, the two molecules maintain their ideal momentum before and after the collision. This means that if they had 1.5 kg • m/s before the collision, this value must be maintained after the collision. All these concepts are presented in the sample response.

Answer:

What did you include in your response? Check all that apply. The law of conservation of momentum is satisfied. The momentum before the collision is 1.5 kg • m/s. The momentum after the collision is 1.5 kg • m/s. The momentum before and after the collision is the same.

Explanation:

The sample response presented in the question above, refers to a closed system where two molecules after colliding satisfy the conservation of momentum law, which can also be called the conservation law of linear momentum. This law states that in a closed system the initial state of the components must be maintained and remain the same until the final state, that is, the two molecules maintain their ideal momentum before and after the collision. This means that if they had 1.5 kg • m/s before the collision, this value must be maintained after the collision. All these concepts are presented in the sample response.

Answer:

False

Explanation:

Friction is a force exerted by a surface against the motion of a body across its surface. Therefore, friction is a type of contact force only.

Explanation:

4) The net torque on the on the meter stick is equal to zero in order to have no rotation.

[tex]\tau_{1} = \tau_{2}[/tex]

[tex]F_{1}d_{1} = F_{2}d_{2}[/tex]

[tex](8 \:N)(0.3\: m) = F_{2}(0.1 \:m)[/tex]

[tex]F_{2} = \frac{(8 \:N)(0.3 \:m)}{(0.1 \:m)} = 24 \:N[/tex]

5) We are going the same equations in #4 here.

[tex]F_{1}d_{1} = F_{2}d_{2}[/tex]

[tex](500 \:N)(2.4 \:m) = F_{2}(3.0 \:m)[/tex]

[tex]F_{2} = \frac{(500 \:N)(2.4 \:m)}{(3.0 \:m)} = 400 \:N[/tex]

Answer:

1.

a. T

b. F

c. T

d. F

e. T

2. Liquid, gas, solid

3. Water

4.

a. Solid

b. Gas

c. Water

5.

a. Add heat

b. Remove heat

c. Add heat

Answer:

Explanation:

If the hippo is laying on the rock, I'm assuming that there is no movement going on at all, in either the hippo or the rock. If no movement occurs, there is no work being done.

Answer:

Answer is 98 joules

Explanation:

P. E=2*9.8*3=98

S.i unit of potential energy ⚡ is joules

So answer is 98 joules

Answer:

d) All the above

Explanation:

Therefore, as all of the physical quantities have the same SI units, the answer is d) all of the above.

Answer:

An ionic compound is named first by its cation and then by its anion. The cation has the same name as its element.

Answer:

0.87

Explanation:

Given :

Mass of bottle = 29.2 g

Mass when filled with diesel = 116.2 g

Mass when filled with water = 129.2 g

The mass of water = (Mass when filled with water - mass of bottle)

Mass of water = 129.2 - 29.2 = 100 g

Mass of diesel = (Mass when filled with diesel - mass of bottle)

Mass of diesel = 116.2 - 29.2 = 87

Relative density of diesel = mass of diesel / mass of equal volume of water

Relative density = 87 / 100 = 0.87

Answer:

True

Explanation:

Minerals can be defined as any form of naturally occurring, inorganic solid substance characterized by a crystal structure. Also, minerals are homogeneous in nature with a defined chemical composition and characterized by a crystal structure comprising of ions, atoms, or molecules in an orderly arrangement.

Generally, molecules attach on the inside of a mineral to give it shape. Therefore, the molecule of a mineral is a crystal three-dimensional regular structure (arrangement) of chemical particles that are bonded together and determines its shape.

Furthermore, the chemical composition (property) of a mineral reflect the presence and arrangement of atoms in each.

Due to the fact that these molecules are structurally arranged (ordered) and are repeated by different symmetrical and translational operations, they determine the shape of minerals. Some examples of minerals are iron, copper, aluminum, tin, coal, quartz, feldspar, mica, etc.

Additionally, inorganic-crystalline solid substances which are found naturally within earth are referred to as minerals.

In conclusion, a mineral in the earth's crust exists naturally in form of solid elements or compounds.

Aslaam 3lekm m3akm yaseen my 8nat alninkm

(a) 39 V

(b) 7.8 V

(a) Neglecting the internal resistance of the battery, the voltage drop (V) across the battery is found from Ohm's law as follows;

V = IR                -------------------------(i)

Where;

I = current through the battery

R = total resistance of the circuit.

From the question;

I = 0.75A

R = 52.0Ω

Substitute the values of I and R into equation (i)

=> V = 0.75 x 52.0

=> V = 39Volts

Therefore, the voltage drop across the battery is 39 Volts

(b) Since the set of lanterns is connected in series, then the same current flows through each of the lanterns. Also, since the lanterns are identical, the resistance ([tex]R_{L}[/tex]) of each of them is given by the total resistance (R = 52.0Ω) divided by the number of lanterns. i.e

[tex]R_{L}[/tex] = [tex]\frac{52.0}{5}[/tex]

[tex]R_{L}[/tex] = 10.4Ω          [Each lantern has a resistance of 10.4Ω]

The current flowing through them is the same as the current (I = 0.75A) flowing the circuit.

Therefore, using Ohm's law, the voltage drop ([tex]V_L[/tex])across each load (lantern) is

[tex]V_L[/tex] = I x [tex]R_{L}[/tex]

[tex]V_L[/tex] = 0.75 x 10.4

[tex]V_L[/tex] = 7.8Volts

Therefore, the voltage drop across each load is 7.8 Volts

Answer: The statement gaining potential energy is always associated with a force field, is true about potential energy.

Explanation:

The energy acquired by an object due to its position is called potential energy.

Basically, a force field exerts a force that gives rise to potential energy of an object. For example, gravity, spring force etc.

This means that gaining potential energy is always associated with a force field.

A change in position does not always means that an object gains potential energy. For example, a spring will have more potential energy when it is compressed or stretched.

Hence, change in position of an object not necessarily means always gain in potential energy.

There are two types of potential energy that is, gravitational potential energy and elastic potential energy.

Thus, we can conclude that the statement gaining potential energy is always associated with a force field, is true about potential energy.

Answer:

Explanation:

The first one and the last one are the correct answer.

Answer:

Primera Ley de Newton, también llamado Ley de la Inercia de Newton.

Explanation:

Este concepto es la Primera Ley de Newton o Ley de la Inercia de Newton, la cual dice textualmente que todo cuerpo al cual no se aplica ninguna fuerza externa neta no nula sobre sí se encuentra en reposo o desplazándose a velocidad constante.

Entiéndase a la inercia como la tendencia de un cuerpo a oponerse al cambio en su estado de movimiento.

Answer:

7 seconds

Explanation:

he went down -28 m/s so 7 times -4 equals -28 m/s which is what he needed to slowness down to 10 m/s