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aliina [53]
3 years ago
7

A 55 kg boy is riding a skateboard at a speed of 1.0 m/s. What is his kinetic energy?

Physics
1 answer:
Komok [63]3 years ago
8 0

Answer:

27.5

Explanation:

KE=1/2m(v)^2

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What are two uses of total internal reflection? (GCSE Physics)
jeka94

Answer:

1) Used in optical instruments such as telescopes.

2) Used to form mirages

Explanation:

1) Perhaps the simplest example of this is the astronomical refractor telescope with a right-angle eyepiece holder. Astro scopes mostly point at things high in the sky, but it is inconvenient to place your eye low to look up through the scope, so the light path is bent 90 degrees just before the eyepiece. This can be done with a mirror, but using a simple 45 degree prism (internal angles 45, 45, and 90 degrees) will do the 90 degree bend more efficiently.

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3 0
3 years ago
<img src="https://tex.z-dn.net/?f=If%20%20%5C%3A%20the%20%5C%3A%20%20speed%20%5C%3A%20of%20%5C%3A%20a%20%5C%3A%20car%20%5C%3A%20
nadezda [96]

Answer:

72 km/h

Explanation:

Speed of car = 20m/s

So, here to find the speed in km/h we will change the metre to km and seconds to hours .

=>

\frac{20}{1000}  \div  \frac{1}{3600}

= 72 km/hr

to change into km divide by 1000

(1 m = 1/1000km)

and,

to change into hours divide by 60*60= 3600

help kiya kya?

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Thes are all correct :<span>2.Scientists observe natural events occurring around them. They question these observations and investigate them.

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Kinetic energy = 0.5 * m * v²

m mass
v velocity

If the velocity stays the same and the kinetic energy goes down by a factor of 2, the mass must go down by a factor of 2 also.
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3 years ago
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