PHYSICS HIGH SCHOOL

A cyclist rides in a circle with speed 8.1 m/s. What is his centripetal acceleration if the circle has a radius of 27 m? A. 3.3 m/s^2 B. 2.4 m/s^2 C. 0.3 m/s^2 D. 1.8 m/s^2

Answers

Answer 1

Answer: The answer would be B. 2.4

You're welcome.

Answer 2

Answer:

Answer:

Answer is B. Just took it!

Explanation:

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Imagine the door to a theatre is opened and you are standing outside. How is it possible that you can hear the sound of the movie or play even if you cannot see the screen or stage ?A) reflection only happens with sound waves not waves of light so the sound waves bounce out to your ears.

B) the sound waves refract as they move from one medium to another

C) the darkness in the theatre absorbed light but not sound so you can hear

D) the sound waves diffract much more than the light waves so try bend and spread as they move through the doorway.

Answers

Imagine the door to a theatre is opened and you are standing outside. You can hear the sound of the movie or play even if you cannot see the screen or stage because the sound waves diffract much more than the light waves so try bend and spread as they move through the doorway. The answer is letter D

A total solar eclipse is visible froma. all over Earth.
b. only within the moon’s umbra.
c. only within the moon’s penumbra.
d. only the dark side of Earth.

Answers

Answer:

b. only within the moon’s umbra.

Explanation:

Solar eclipse occurs when Moon comes between the Sun and the Earth in straight line and blocks the sunlight. A shadow of moon castes on the surface of the Earth. The region passing through the moon's umbra would view a total solar eclipse. The moon completely hides the surface of the sun. It would be visible to the people residing in the bright side of the Earth within the Umbra of the moon.

Only within the umbra of the moon's shadow.

FASTA ball has 116.62 J of gravitational potential energy at a height of 85 m. What is the mass of the ball?

a.0.14 kg
b.0.37 kg
c.11.9 kg
d.21.82 kg

Answers

Answer:

a)0,14 kg

Explanation:

Formula to calculate the gravitational potential energy:

U= m *g*h : equation (1)

U: It's gravitational potential energy in Joules (J)

m: body mass in kilograms (kg)

g= the acceleration of gravity ( $m/s^(2)$ )

h= the body heigt measured from the floor (m)

Known information:

U= 116.62 J

g = 9.8 $m/s^(2)$

h =85m

mass calculation:

We replace the known information in equation 1 :

116.62 = m*9.8*85

m =116.62/(9.8*85)

m= 0,14 kg

The mass of the ball is 0,14 kg

The answer is a. 0.14 kg

PE = mgh
116.62 = m•(9.8)•(85)
m = 116.62/(9.8•85)
= 0.14 kg

What is Newton’s second law of motion

Answers

The acceleration of an object as produced by a net force.

The rate of change in momentim is proportinal to the law of force. I think if I'm wrong then I apolagize

Which of the following contains the most thermal energy?a. a cup of hot water
b. a cup of cold water
c. a hot tub full of hot water
d. a large bucket of hot water

Answers

the answer would be c.

A situation were you can accelerate even though your speed doesn't change

Answers

'Acceleration' doesn't mean 'speeding up'. It means any change in the speed ordirection of motion. Any motion that's not constant speed in a straight line is accelerated motion.
Here are a few. I'm sure you can think of lots more.

-- go around a curve on a bicycle or in a car
-- jump up in the air and come down again
-- jump from a diving board
-- stop pedaling or turn off the engine and coast to a stop
-- ride a satellite in orbit around the Earth
-- stand still on the Earth, and let it spin you around in a circle in 24 hours

Answer:

Explanation:

airplane flying around in a circle

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While John is traveling along an interstate highway, he notices a 194-mile marker as he passes through town. Later John passes another mile marker, 104. (a) What is the distance between town and John's current location? (b) What is John's current position?