Questions from College Physics

Q: Spaceship A moves away from Earth at a speed of 0.

Spaceship A moves away from Earth at a speed of 0.800c (Fig. P26.25). Spaceship B pursues at a speed of 0.900c relative to Earth. Observers on Earth see B overtaking A at a relative speed of 0.100c. W...

Q: A pulsar is a stellar object that emits light in short bursts

A pulsar is a stellar object that emits light in short bursts. Suppose a pulsar with a speed of 0.950c approaches Earth, and a rocket with a speed of 0.995c heads toward the pulsar. (Both speeds are m...

Q: A rocket moves with a velocity of 0.92c to the

A rocket moves with a velocity of 0.92c to the right with respect to a stationary observer A. An observer B moving relative to observer A finds that the rocket is moving with a velocity of 0.95c to th...

Q: A proton moves with a speed of 0.950c. Calculate

A proton moves with a speed of 0.950c. Calculate (a) Its rest energy, (b) Its total energy, and (c) Its kinetic energy.

Q: Protons in an accelerator at the Fermi National Laboratory near Chicago are

Protons in an accelerator at the Fermi National Laboratory near Chicago are accelerated to a total energy that is 400 times their rest energy. (a) What is the speed of these protons in terms of c? (b)...

Q: If astronauts could travel at v = 0.950c, we

If astronauts could travel at v = 0.950c, we on Earth would say it takes (4.20/0.950) = 4.42 years to reach Alpha Centauri, 4.20 light - years away. The astronauts disagree. (a) How much time passes o...

Q: The “scale” of a certain map is 1/10

The “scale” of a certain map is 1/10 000. This means the length of, say, a road as represented on the map is 1/10 000 the actual length of the road. What is the ratio of the area of a park as represen...

Q: Rank the results of the following calculations in order of the number

Rank the results of the following calculations in order of the number of significant figures, from least to greatest. (a) 6.85 × 10−5 m + 2.7 × 10−7 m (b) 702.35 km + 1897.648 km (c) 5.0 m × 4.302 m (...

Q: How many significant figures should be written in the product 0.

How many significant figures should be written in the product 0.007840 6 m × 9.450 20 m? (a) 3 (b) 4 (c) 5 (d) 6 (e) 7

Q: One kilometer is approximately (a) 2 miles

One kilometer is approximately (a) 2 miles (b) 1/2 mile (c) 1/10 mile (d) 1/4 mile