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4 years ago

Farmer Tamar airlifted her sheep from 1000 meters to 1,200 meters

Physics

1 answer:

attashe74 [19]4 years ago

4 0

Question

What was the change in potential energy of the sheep?

Answer:

1962(m) J

Explanation:

Potential energy is given by

PE=mgh

Change in potential energy is given by

∆PE=mg(h2-h1)

Where ∆PE is the change in potential eneegy, g is acceleration due to gravity, h2 is final height and h1 is the initial height.

Substituting 9.81 m/s² for g, 1200 m for h2 and 1000 m for h1 then

∆PE=m*9.81(1200-1000)=1962m Joules

Since we are not given the mass of rhe sheep, the answer will be 1962(m) Joules

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Un contenedor de 1800 N está en reposo sobre un plano inclinado a 28°, el coeficiente de fricción entre el contenedor y el plano

babunello [35]

Answer:

F = 1480.77N

Explanation:

In order to calculate the required force to push the container with a constant velocity, you take into account the the sum of force on the container is equal to zero. Furthermore, you have for an incline the following sum of forces:

$F-Wsin\alpha-F_r=0\\\\F-Wsin\alpha-N\mu cos\alpha=0\\\\F-Wsin\alpha-W\mu cos\alpha=0$ (1)

F: required force = ?

W: weight of the container = 1800N

N: normal force = weigth

α: angle of the incline = 28°

g: gravitational acceleration = 9.8m/s^2

μ: coefficient of friction = 0.4

You solve the equation (1) for F and replace the values of the other parameters:

$F=W(sin\alpha+\mu cos\alpha)\\\\F=(1800N)(sin28\°+(0.4)cos28\°)=1480.77N$

The required force to push the container for the incline with a constant velocity is 1480.77N

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3 years ago

Which characteristic of a light wave must increase

anzhelika [568]

The answer is 4.

The speed of light is faster in the air than in the glass, because a wavelength can be refracted in glass. Because the speed increases when the light wave passes from glass into air, the wavelength will also increase.

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3 years ago

Two astronauts are working on the lunar surface to install a new telescope. The acceleration due to gravity on the moon is only

nydimaria [60]

Answer:

Its velocity and acceleration are both nonzero.

Explanation:

The path of the wrench is trajectory while the acceleration due to Moon's gravity is acting on it.

As the velocity follows the path, as soon as it reaches maximum height, the vertical component of velocity is zero but the horizontal component is still there, constant.

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3 years ago

If a light Ray is aimed so that it bounces off a metal drain in a pool, the light Ray will reflect off the drain according to ?

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Answer:

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Explanation:

When a light ray reflects off a surface, it obeys the law of reflection.

A few definitions before giving the law of reflection:

- The angle of incidence is defined as the angle between the incident ray and the normal to the surface

- The angle of reflection is defined as the angle between the reflected ray and the normal to the surface

The law of reflection states that: