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4 years ago

A force of 400 N is applied to move a truck through a distance of 30 metres. What work is

Physics

1 answer:

Citrus2011 [14]4 years ago

6 0

Answer:

$\huge \boxed{\mathrm{12000 \ J}}$

Explanation:

Work done (J) = Force (N) × Distance (m)

<em>W</em> = 400 × 30

<em>W</em> = 12000

The work done is 12000 J.

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Record two activities where you would expect to have a steep learning curve, two where you would have an “average” learning curv

lora16 [44]

Answer:

Explanation:

3 0

2 years ago

A force of 10. N toward the right is exerted on a wooden crate initially moving to the right on a horizontal wooden floor. the c

Artyom0805 [142]

1) 5 N

The crate is initially moving, so we must calculate the force of kinetic friction, which is given by:

$F_f = \mu_k mg$

where

$\mu_k=0.2$ is the coefficient of friction between the crate (made of wood) and the floor (made of wood). The coefficient of kinetic friction between wood and wood is about 0.2.

$mg=25 N$ is the weight of the crate

Substituting the numbers into the formula, we find

$F_f=(0.2)(25 N)=5 N$

2) 5 N

There are two forces acting on the crate along the horizontal direction:

- The force that pushes the crate toward the right, of magnitude $F=10 N$

- The force of friction, which acts in the opposite direction (so, towards the left), of magnitude $F_f = 5 N$

Since the two forces are in opposite directions, the net force is given by their difference:

$F_{net}=F-F_f = 10 N-5 N=5 N$

3) Yes

The crate is accelerating. In fact, according to Second Newton's Law:

$F_{net}=ma$ (1)

where Fnet is the net force on the crate, m is its mass, a is its acceleration. We can immediately see that since Fnet is not zero, the acceleration is also non-zero, so the crate is accelerating.

We can even calculate the magnitude of the acceleration. In fact, the mass of the crate is given by:

$m=\frac{Weight}{g}=\frac{25 N}{9.8 m/s^2}=2.55 kg$

And by using (1) we find

$a=\frac{F_{net}}{m}=\frac{5 N}{2.55 kg}=1.96 m/s^2$

3 0

3 years ago

What is Restoring force for large waves is A. Wind, B. Capillary Action, C. Diffusion D.Friction, or E. Gravity

jek_recluse [69]

The answer would be c.diffution

7 0

3 years ago

The current in a hair dryer measures 19 amps. The resistance of the hair dryer is 14 ohms. What is the voltage?

Masja [62]

Voltage = (current) x (resistance)

= (19 A) x (14 ohms) = 266 volts .

Note: Be careful using that thing !

It's dissipating

I² R = (19 A)² x (14 ohms) = 5,054 watts ! ! !

That's an awful lot of power for a blow-dryer !

The dryer is certainly not using very much of that power to run the fan.
Most of it is being used to heat air. 5 kilowatts is more power than most
toasters or microwave ovens use, so please be careful with how much of
your hair or skin you expose to that hot-air blast. You could probably cook
a meatloaf with it.

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3 years ago

You are listening to music in your room and you are asked to turn down the volume of your music. When you turn down the volume w

djyliett [7]

The sound waves will get smaller and smaller till there is no more bc it is off.

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4 years ago