Questions from College Physics

Q: A Boy Scout starts a fire by using a lens from his

A Boy Scout starts a fire by using a lens from his eyeglasses to focus sunlight on kindling 5.0 cm from the lens. The Boy Scout has a near point of 15 cm. When the lens is used as a simple magnifier,...

Q: The control panel on a spaceship contains a light that blinks every

The control panel on a spaceship contains a light that blinks every 2.00 s as observed by an astronaut in the ship. If the spaceship is moving past Earth with a speed of 0.750c, determine (a) The prop...

Q: A star is 15.0 light - years (ly)

A star is 15.0 light - years (ly) from Earth. (a) At what constant speed must a spacecraft travel on its journey to the star so that the Earth–star distance measured by an astronaut onboard the spacec...

Q: The proper length of one spaceship is three times that of another

The proper length of one spaceship is three times that of another. The two spaceships are traveling in the same direction and, while both are passing overhead, an Earth observer measures the two space...

Q: Suppose you are observing a binary star with a telescope and are

Suppose you are observing a binary star with a telescope and are having difficulty resolving the two stars. Which color filter will better help resolve the stars? (a) Blue (b) Red (c) Neither because...

Q: A car traveling at 35.0 m/s takes 26

A car traveling at 35.0 m/s takes 26.0 minutes to travel a certain distance according to the driver’s clock in the car. How long does the trip take according to an observer at rest on Earth? Hint: The...

Q: A supertrain of proper length 1.00 x 102 m travels

A supertrain of proper length 1.00 x 102 m travels at a speed of 0.95c as it passes through a tunnel having proper length 50.0 m. As seen by a trackside observer, is the train ever completely within t...

Q: A box is cubical with sides of proper lengths L1 = L2

A box is cubical with sides of proper lengths L1 = L2 = L3, as shown in Figure P26.14, when viewed in its own rest frame. If this block moves parallel to one of its edges with a speed of 0.80c past an...

Q: (a) What is the momentum of a proton moving at

(a) What is the momentum of a proton moving at 0.900c? (b) At what speed will a particle’s relativistic momentum equal twice its classical momentum?

Q: At what speed do the classical and relativistic values of a particle’s

At what speed do the classical and relativistic values of a particle’s momentum differ by 10.0%?