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4 years ago

A 40kg rock is perched atop a cliff that is 50 m high. What is it’s potential energy?

1 answer:

4 0

Potential energy, is energy due to its position.

Given: Mass m = 40 Kg; Height h = 50 m

Required: Potential energy P.E = ?

Formula: P.E = mgh P.E = (40 Kg)(9.8 m/s²)(50 m)

P.E = 19,600 J

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A 4.88 x 10-6 C charge moves 265 m/s

Alex73 [517]

Answer:

$F=0N$

Explanation:

From the question we are told that:

Charge $Q=4.88 x 10-6 C$

Velocity $v= 265m/s$

Angle $\theta =0 \textdegree$

Magnetic field $B=0.0579T$

Generally the equation for Force is mathematically given by

$F=Q(\=v*\=B)$

$F=qvBsin\theta$

Therefore

$F=qvBsin0 \textdegree$

$F=0N$

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3 years ago

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A copper sphere was moving at 25 m/s when it hit another object. This caused all of the KE to be converted into thermal energy f

Verdich [7]

Answer:

$\Delta T = 0.81 ^oC$

Explanation:

As we know by energy conservation

All its kinetic energy will convert into thermal energy to raise its temperature

$\frac{1}{2}mv^2 = ms\Delta T$

now divide both sides by mass of the object

$\frac{1}{2}v^2 = s\Delta T$

so change in temperature is given as

$\Delta T = \frac{v^2}{2s}$

$\Delta T = \frac{25^2}{2\times 387}$

$\Delta T = 0.81^oC$

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3 years ago

A truck has a velocity of 25 m/s and a momentum of 25.000 kg*m/s. What is its<br> mass?

Andrew [12]

Answer:

1000kg

Explanation:

We can use the equation "p=mv"

p is the momentum in kg m/s
m is the mass measured in kg
v is the velocity measured in m/s

If we rearrange the equation to find mass (m), then the equation becomes:

m=p/v

We can substitute in the values of p and v as they are already given in the question.

p=25,000 kg m/s
v= 25 m/s

So, now we just substitute in the values to get our answer.

m=p/v

m=25,000/25

m=1000kg

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3 years ago

Total energy input is 1400 and my efficiency is 80% so what is the useful energy output in jules?

Ierofanga [76]

Answer

1400 * 0.8 = 1,120

the useful energy output is 1,120 joules

4 0

3 years ago

A person standing at the top of mountain aconcagua would be approximately 4.3 mi high. the radius of earth is 3959 mi. what is t

Brums [2.3K]

The answer is 184.6 hope this helped (:

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4 years ago

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