Physics Answers

What is the speed of a car that went 32 miles in 0.50h?

Ariel dropped a golf ball from her second story window. The ball starts form rest and hits the sidewalk 1.5 seconds later with a velocity of 14m/s. Find the avarage acceleration of the golf ball

a diver of mass 80kg,steps off a diving board at point a 4,0 m above the level of the water of a swimming pool.the diver enters the water at point b and comes to rest at point c.while the diver falls through the air,an average frictional force of magnitude 172n acts on the diver. the total work done on the diver by no conservative forced while he moves from a to c is -6240j

A particle travels at 1.90×10⁸ m/s and lives 2.10×10⁻⁸ s when at rest relative to an observer. How long does the particle live as viewed in the laboratory?

c = 3.0×10⁸

If astronauts could travel at v=0.950 c, we on Earth would say it takes 4.42 years to reach Alpha Centauri. The astronauts disagree.

 How much time passes on the astronauts' clocks?

c = 3×10⁸

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 0.750 c, determine the time interval between blinks as observed by a person on Earth.

c = 3times10^8

Roger is travelling with a speed of 0.800c relative to Mia. Roger travels for 50.0 s as measured on his watch.

 Calculate the elapsed time on Mia’s watch during this motion.

c = 3.0 ×

10⁸

What distance separates two objects of equal mass (5 kg) that are experiencing a gravitational force of 100 N?

What is the force of gravity between two sacks of rice and corn with a masses of 50.0 kg and 68.0 kg separately by 15.0 m?

3.A heat engine makes use of the thermal cycle shown. The working fluid is 3 grams of nitrogen, an ideal diatomic gas. There are two isobaric and two isochoric processes:

p1 = 1×10⁶ Pa, p2 = 2×10⁶ Pa

V1 = 500 cm³, V2 = 1000 cm³.

a) What is the temperature, T, of the gas at point 4 (p1, V1)?

A.  T = 120 K

B.  T = 561 K

C.  T = 842 K

b) How much work, Wby, does the gas do in the 1→2 process?

 A.  Wby = -1000 J

B.  Wby = -500 J

C.  Wby = 500 J

D.  Wby = 1000 J