A freight car moves along a frictionless level railroad track at constant speed. The freight car is open on top. A large load of coal is suddenly dumped into the car. What happens to the speed of the freight car?
A) It increases.
B) It remains the same.
C) It decreases.
D) It becomes zero.
E) Cannot be determined from the information given.
C
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The extinction of starlight due to the interstellar medium I. is the greatest in the ultraviolet. II. is the greatest in the infrared. III. is caused by ionized hydrogen. IV. is caused by dust particles
a. I & III b. II & III c. I & IV d. II & IV e. only IV
A projectile is projected from the origin with a velocity of 45.0 m/s at an angle of 30.0 degrees above the horizontal. What is the range of the projectile?
A. 92.0 m B. 105 m C. 134 m D. 179m E. 205 m
Asteroids which could possibly collide with the Earth at some time in the future are known as
A) killer asteroids B) Earth-crossing asteroids C) Armageddon asteroids D) potentially hazardous asteroids
When a moving object's velocity doubles, its kinetic energy increases by a factor of ______________
Fill in the blank(s) with correct word