2 years ago

Introduction to forces

Physics

1 answer:

ELEN [110]2 years ago

8 0

Answer: Force

A push, pull or twist that can change an object's position, direction, speed or shape.

Explanation:

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At what speed, in m/s, would a moving clock lose 1.3ns in 1.0 day according to experimenters on the ground?

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Answer:

v=0.14c

Explanation:

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In a carnival ride, passengers stand with their backs against the wall of a cylinder. The cylinder is set into rotation and the

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Answer:

Minimum speed will be equal to 2.213 m/sec

Explanation:

We have given radius of the r = 2 m

Coefficient of friction $\mu =0.25$

At minimum speed frictional force will be equal to centripetal force

So $\mu mg=\frac{mv^2}{r}$

$\frac{v^2}{r}=\mu g$

$v=\sqrt{\mu rg}=\sqrt{0.25\times 2\times 9.8}=2.213m/sec$

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1. A tree is making a 12 m shadow on the ground, the angle of elevation is 30 degrees, what is the height of the tree?

makvit [3.9K]

Answer:

6.93m

Explanation:

Using the method of SOH CAH TOA

The base of the tree is 12m which is the adjacent side of the triangle to be generated, the height of the tree will be facing the angle of elevation and it is the opposite side.

Using the formula tan(theta) = Opposite/Adjacent

Given theta = 30°

Adjacent is 12m which is the distance the tree is making with the shadow on the ground

Opposite side will be the height of the tree.

Tan(theta) = height/12

Tan30° = height/12

Height = 12tan30°

Height = 6.93m

Therefore the height of the tree is 6.93m

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4 years ago

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Noah runs 200 m to the east and then 400 m north. What is Noah's distance and displacement?

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Answer:

Noah has run 600 metres north east

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2 years ago