1) The angular velocity of a cylinder decreases from 3 rad/s to 2 rad/s in 20 rev. at constant acceleration. a) α=? b) How much time does it take? 2) A block...

1) The angular velocity of a cylinder decreases from 3 rad/s to 2 rad/s in 20 rev. at constant acceleration. a) α=? b) How much time does it take? 2) A block...

A resistor is placed in a circuit. The current in the circuit is 2 amperes and the voltage drop across the resistor is 8 volts. The voltage is then increased to 12 volts. What will be the new current...

A baritone guitar has a longer neck than a normal guitar. A mandolin has a much shorter neck than a normal guitar. When notes are played on all of the instrument’s top (thickest) string, which guitar...

1. What happens to the pitch of a sound when: a) The length of a vibrating string is increased? b) The string’s tension is decreased? c) The mass of a vibrating string is increased? d)...

A diagram shows a moving 5.00-kilogram cart at the foot of a hill 10.0 meters high. What is the minimum kinetic energy needed for the cart to move from its current position to reach the top of the...

How does quantum theory explain blackbody radiators? A. Raising the temperature results in the radiator giving off photons of high-energy ultraviolet light. B. As the radiator is heated,...

Special relativity can be used to study an object in which frame of reference? A. A frame of reference that has no change in velocity B. A frame of reference that is moving in a circle C...

How would an observer on train A, which is moving close to the speed of light, view a clock in train B, which is stationary at the train station? A. The clock in train B appears to be the same...

just had a doubt in this concept

Just had a doubt on the concepts of physics

What wave characteristic stays the same in solids liquids and gasses? Do waves travle faster in solids or gasses?

A 2,000-kilogram car travels at a constant speed of 15 meters per second around a circular curve of radius 20 meters. What is the magnitude of the centripetal acceleration of the car as it goes around...

A 0.50-kg sphere at the top of an incline has a potential energy of 8.0 joules relative to the base of the incline. Rolling halfway down the incline will cause the sphere's potential energy to be...

A rollercoaster track provides 6400 N of centripetal force on a rollercoaster car. The car travels at a speed of 22 m/s as it rounds a horizontal curve with a radius of 15 m. What is the mass of the...

Are the following roller coasters accelerating? Yes or No? And explain why please. A roller coaster speeding up? A roller coaster speeding down? A roller coaster moving in a straight...

A 750-Newton man is standing on a bathroom scale in an elevator. When the elevator is moving, the man notices that the scale is reading 780 N. How would you describe the motion of the elevator?...

Light travels through space at a speed of 3.0 108 m/s. A space probe is traveling toward Earth at 2.5 108 m/s when one of its spotlights is turned on. What speed would an observer on Earth measure...

Which of the following accurately states the claim of special relativity with respect to the speed of light? A. The speed of light in a vacuum is faster for frames of reference that have a constant...

A question asks us to find power output of a single panel when its area is give as 9.5 and the radiation flux is given as 590 and efficiency is given as 26 percent. I managed to find power by 590*9...

At the bottom of the loop of your roller coaster, the velocity is 30 m/s and the radius of the loop is 50 m. Is the amount of acceleration riders will experience in this loop considered safe? Why...

Stephen T.

Knowledgeable and Effective MCAT Expert

New York, NY

4.9
(156 ratings)

Irene P.

Enthusiastic astronomy, physics, math tutor

Brooklyn, NY

4.8
(41 ratings)

David M.

Experienced Teacher and Tutor for Math, Science and beyond!

New York, NY

4.9
(668 ratings)