whats the answers to this??

Answer:

when The spoon is pulled down with a small amount of energy : short distance travelled by Marsh mallow

When the spoon is pulled down with a higher amount of energy : Long distance travelled by Marshmallow

Explanation:

when The spoon is pulled down with a small amount of energy :

After the release of the spoon  the Marshmallow travels a relatively short distance because the acceleration is < mass of the mass of the Marshmallow

F = ma. hence a = F/m    where a < m

When the spoon is pulled down with a higher amount of energy

After the release of the spoon the marshmallow travels a relatively long distance when compared to the application of small amount of energy

Answer:

30's-40's

Explanation:

Answer:

82.2

Explanation:

Answer:

84 J

Explanation:

Work by mover:

W = Fd

W = 496 J (2.1 m)

W = 1042 J

Work by dolly and ramp:

W = Fd

W = (mg)d

W = 115 kg (9.8 m/s/s) (0.85 m)

W = 958 J

1042 J - 958 J

= 84 J

The amount of work  spent in overcoming friction is 83.65 J.

From the question,

The amount of work spent in overcoming friction = work done by the mover-potential energy of the refrigerator.

This is expressed mathematically as,

W' = Fd-mgh................... Equation 1

Where W' = work spent against friction, F = force applied, d = distance, m = mass of the refrigerator, g = acceleration due to gravity, h = height.

From the question,

Given: F = 496 N, d = 2.10 m, m = 115 kg, h = 0.85 m

Constant: g = 9.8 m/s².

Substitute these values into equation 1

W' = 496(2.1)-(115×9.8×0.85)

W' = 1041.6-957.95

W' = 83.65 J.

Hence, the amount of work  spent in overcoming friction is 83.65 J

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Answer:

if 325 m ÷ 30

Explanation:

if 325 m ÷30 min then the answer would be 10.8 km /hour

Answer:

Gamma rays are mostly used in the radiotherapy/ radiooncology to treat cancer. They can also be used to spot tumours. Gamma rays can kill living cells and damage malignant tumor

Answer:

20 N up

Explanation:

Since the object on the floor is sitting still. Based on Newton's law of force. Objects must have equal reaction and force against each other for still objects. So the answer is 20 N up. Since the force are equal on both sides making the object not moving.

Answer:

the correxct adnswer is d

Explanation:

lol

Answer:

C

Explanation:

I guess...

Sorry if it's wrong

Answer:

When there are two or more electrical devices in a circuit with an energy source, there are a couple of basic ways by which we connect them. They can either be connected in series or parallel

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A series circuit has only one path for electricity to flow from one point to another. The amount of electricity in the circuit is consistent throughout any component in the circuit. When electricity flows through a series circuit, its rate of flow (speed) will never fluctuate. The total resistance of a series circuit equals the sum of individual resistances. The more resistors that a series circuit has, the more difficult it is for electrons to flow.

A parallel circuit has multiple paths for electricity to flow from one point to another. According to website All About Circuits, “all components are connected between the same set of electrically common points.” Often, resistors and sources will be connected between two sets of electrically common points. In a parallel circuit, electricity can flow in multiple directions horizontally and vertically. The components of a parallel circuit will have the same voltage across their ends and will have identical polarities.

Answer:

a.  5.1 m/s b. 149.42°

Explanation:

a. Velocity of boat relative to earth, V = velocity of boat relative to river, V'+ velocity of river relative to earth, v.

We add these vectorially.

Since velocity of boat relative to river is 2.6 m/s due north and velocity of river relative to earth is 4.4 m/s due east, we apply Pythagoras' theorem and add them together since both velocities are perpendicular to each other.

So, V² = V'² + v² = (2.6 m/s)²  + (4.4 m/s)² = 6.76 (m/s)² + 19.36 (m/s)² = 26.12 (m/s)²

V = √[26.12 (m/s)²]

V = 5.1 m/s

b. Since the relative velocities of the ferry relative to the water and the velocity of the river relative to the earth are the components of the velocity of the ferry relative to the earth, the y - component being the velocity of the ferry relative to the earth since it is due north, and the x- component being the velocity of the river relative to the earth since it is due east. So, we have that

tanФ = y - component/x - component = V'/v where Ф is the angle between V and the west direction.

tanФ = V'/v

tanФ = 2.6 m/s ÷ 4.4 m/s

tanФ = 0.5909

Ф = tan⁻¹(0.5909)

Ф = 30.58°

So, the angle measured from due east with counterclockwise direction positive is 180° - Ф = 180° - 30.58° = 149.42°

Answer:

It is because the load is in between fulcrum and effort making a longer effort arm than the load arm resulting to multiplication of force and a mechanical advantage of greater than 1.

Explanation:

The distance from the fulcrum to the effort is the effort arm where as the distance from the fulcrum to the load is the load arm.

The first class lever has a mechanical advantage that varies per the position of the load with respect to effort position from the fulcrum. They have the fulcrum at the middle. For example, a beam balance and a pliers. The formula to remember is FLE for easy categorization of the lever classes.

The second class lever , the load is at the middle.For example a wheel barrow and a bottle opener. In this class, the effort arm is longer than the load arm.The effort is force multiplication making the mechanical advantage to be greater than 1.

The third class of lever has effort in the middle.For example a spade or a knife.In this class effort arm is shorter than the load arm, causing change in direction of force. The effect is a mechanical advantage less than 1.

Answer:

potential energy

Explanation:

potential energy

Chemical energy, the energy stored in chemical bonds, is thus considered a form of potential energy. Some everyday examples of potential energy include the energy of water held behind a dam, or of a person about to skydive out of an airplane.

The velocity of a plane that traveled 5000 miles north followed by 10000 miles north in 20 hours would be 750 miles/hour.

The total displacement covered by any object per unit of time is known as velocity. It depends on the magnitude as well as the direction of the moving object.

The mathematical expression for velocity is given by

velocity= total displacement/Total time

The total displacement of the plane = 5000 miles +10000 miles

                                                             =15000 miles

velocity =  displacement/Time

velocity =15000/20 hours

            =750 miles/hour  

Thus, the velocity of the plane would be 750 miles/hour.

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Your question seems incomplete, the complete question is,

what is the velocity of a plane that traveled 5000 miles north followed by 10000 miles north in 20 hours?

Explanation:

Ventilation

Answer:

The velocity with which the 5.0 kg dog has to run to have the same momentum as the 30 kg pig walking at 3.0 m/s is 18 m/s

Explanation:

Given that the mass of the dog = 5.0 kg

The mass of the pig = 30 kg

The speed with which the pig is walking = 3.0 m/s

We have that linear momentum = Mass × Velocity

Therefore, the momentum of the pig, m₁ = 30 kg × 3.0 m/s = 90 kg·m/s

m₁ = 90 kg·m/s

The momentum of the dog m₂ = Mass of the dog × Velocity of the dog

Given that m₁ is to be equal to m₂, we have;

m₁ = 90 kg·m/s = m₂ = Mass of the dog × Velocity of the dog

90 kg·m/s = m₂ = 5.0 kg × Velocity of the dog

m₂ = 5.0 kg × Velocity of the dog = 90 kg·m/s

5.0 kg × Velocity of the dog = 90 kg·m/s

Velocity of the dog = 90 kg·m/s/(5.0 kg) = 18 m/s

The velocity with which the 5.0 kg dog has to run to have the same momentum as the 30 kg pig walking at 3.0 m/s = 18 m/s.

The property of air which makes it effective in protecting firefighters is that it is a poor thermal conductor.

We define air as a mixture of gasses. We know that there a re several gases that are known to compose air and among these are oxygen, carbon dioxide, noble gasses and nitrogen.

We know that air is a poor conductor of heat. As such, air does not heat up quite easily and this would help to protect the fireman from getting burnt since air does not easily allow heat to pass through it as it were, this is why the firefighters depend on the insulative property of air.

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Answer:

Explanation:

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

From the question

mass = 1,460kg

acceleration = 2.04 m/s²

We have

force = 1460 × 2.04

We have the final answer as

Hope this helps you

Answer:

2.204x10^2 -2 = 0.02204 in scientific notation.

Answer:

40,000J

Explanation:

The heat energy required to raise the temperature of unit mass of substance through unit degree is called specific heat of substance . As given 2000J energy is needed to heat 1 kg of paraffin through 1

o

C, therefore specific heat of paraffin will be 2000J/kg−

o

C.

Now, heat energy required to raise the temperature of mass m of substance (specific heat c) through Δt is given by ,

Q=mcΔt,

Given: m=10kg,Δt=2

o

C,c=2000J/kg−

o

C

Q=10×2000×2=40,000J

Answer:

An echo is formed as a result of reflection of the original sound which returns to the listener. You might have experienced Echo in an EMPTY ROOM but no echo is produced after the room is occupied. To avoid echo from being produced the echo has to be absorbed.

Explanation:

Answer:

The acceleration of the object is 0 m/s^2.

Explanation:

To solve this problem, we must remember that acceleration is equal to the change in velocity per unit time.  Since we are given that the velocity is constant, this means it is unchanging, and the acceleration is therefore zero.

Hope this helps!

Answer:

B. when it loses a piece

Explanation: it likely gets lighter

Answer:

It would be -8.6753 x 10 to the 6th power

Explanation

Answer:

84kg

Explanation:

If the mass of an astronaut in on the moon is 84kg on the moon. After the 3weeks in returning home, his weight will not change. The mass of the astronaut will remain the same which is 84kg. This is so because the acceleration due to gravity experienced by the body remains the same both in the earth and in moon.

Answer:

A- Martin brings his friends home to meet grandpa.

Explanation:

took the test.

Answer:

A

Explanation:

on edge :)