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- A rocket is traveling at 0.3 times the speed of light. If it's speed is doubled, by what factor does its energy increase?In a certain particle accelerator, a proton has a kinetic energy that is equal to its rest energy. What is the speed of the proton relative to the accelerator? 0.87 c 0.25 c 0.75 c 0.71 c 0.50 ccody is driving down the road, eastbound, with his dog in the back seat of the car. To an outside observer on the roadside, Cody’s speed is 21.0 meters per second. A blue car is passing them at a relative velocity of 2.5 meters per second. Which of the following statements are accurate about this situation? (Choose all that apply) The blue car’s velocity, to a roadside observer, is 23.5 m/s. The blue car’s velocity, to a roadside observer, is 18.5 m/s. The dog’s velocity, relative to Cody, is 0 m/s. Cody’s velocity, from the blue car’s frame of reference, is −2.5 m/s. Cody is stationary from the blue car’s frame of reference.
- An astronomer on Earth observes red light at 680 nm from a distant galaxy. The astronomy knows that the red light that was emitted from the galaxy source was 656 nm. The speed of light is 3E[8] m/s. Pretend that the Earth is stationary. What is the velocity of the galaxy as measured from Earth and is it approaching or receding?Dan holds a 5.0-m-long ladder parallel to the ground. He then gets up to a good sprint, eventually reaching 98% of the speed of light. How long is the ladder according to Dan, once he is running, and according to Carmen, who is standing on the ground as Dan goes by?Imagine that you are going for a ride in a hot air balloon at the Canowindra Balloon Challenge. While the balloon is rising at a speed of 2.0 m/s, you throw a small ball down at a speed of 5.0 m/s relative to your body. A person who measures the ball's velocity at the instant of release will find that the ball's velocity relative to the ground at that instant is O a. 3.0 m/s, up. O b. 2.0 m/s, up. O c. 3.0 m/s, down. O d. 12.8 m/s, down. O e. 5.0 m/s, down.