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Sav [38]
3 years ago
11

A tow truck drags a stalled car along a road. The chain makes an angle of 30???? with the road and the tension in the chain is 1

500 N. How much work is done by the truck in pulling the car 1 km?
Physics
1 answer:
My name is Ann [436]3 years ago
3 0

Answer: work = 1,305kJ

Explanation:

angle= 30°

force= 1,500N

distance= 1,000m

The formula for work is : Work= force x distance, however there is an angle of 30° between the direction of force applied and the direction of motion, therefore force must be decomposed to its value on the horizontal axis which is the direction of motion by using the cosine of the very angle.

W= F×cos(α)×D

W= 1,500×cos (30)×1,000

W= 1,305kJ ( kilojoules)

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With what force will a car hit a tree if the car has a mass of 3,415 kg and it is accelerating at
weeeeeb [17]

Answer:

F= 17,075\ N

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Use the following photoelectric graph to answer the following question:
klio [65]
The photoelectric effect is obtained when you shine a light on a material, resulting in the emission of electrons.

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K = h(f - f₀)

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f = light frequency
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Rearranging the formula in the form y = m·x + b, we get:
K = hf - hf₀
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Every material has its own threshold frequency, therefore, what stays constant for all the materials is h = Planck constant (see picture attached).

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