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Zarrin [17]
3 years ago
8

if a car is moving down the highway at a constant velocity what does this mean about the cars acceleration?

Physics
1 answer:
Soloha48 [4]3 years ago
8 0
If a car is moving with constant speed that means rate of change of speed is zero. Hence, acceleration is zero.
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A playground slide is inclined 40°. If a boy with a mass of 32 kg slides down for -3meters. How much work is done by gravity on
telo118 [61]

Answer:

the work done by gravity on the boy is 604.62 J

Explanation:

Given;

distance the boy slides, d = 3 m

angle of inclination of the playground, θ = 40⁰

mass of the boy, m = 32 kg

The vertical height, h, above the ground through which the boy falls represents the height of the triangle which is the opposite side.

The distance through which the boy slides, d, represents the hypotenuse side of the right triangle.

sin \theta = \frac{opposite }{hypotenuse} \\\\sin \theta = \frac{h}{d} \\\\h = dsin\theta\\\\h = 3 \times sin(40^0)\\\\h = 1.928 \ m

The work done by gravity on the boy is calculated as;

W = P.E = mgh

             = 32kg x 9.8m/s² x 1.928m

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Therefore, the work done by gravity on the boy is 604.62 J

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3 years ago
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What is an independent variable ?
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Flasher units are being discussed. Technician A says that only a DOT-approved flasher unit should be used for turn signals. Tech
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