As a high-altitude balloon sinks lower and lower into the atmosphere it undergoes a decrease in
A) volume.
B) density.
C) weight.
D) mass.
E) none of the above
Answer: A
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A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal. The projectile lands on a roof that is 4.0 m height. What is the distance along the horizontal axis when the projectile hits the roof?
A. 25.8 m B. 22.3 m C. 19.4 m D. 17.5 m E. 15.0 m
Answer the following statement(s) true (T) or false (F)
1. At time t = 0 a person is sliding due east on a flat, frictionless plane of ice. The net force on this person is due to a battery-powered fan the person holds that exerts a southward thrust force on the person. Assuming that drag is negligible, the eastward component of the person’s velocity is unaffected by this force.
Regular satellites orbit both in the prograde and retrograde directions
a. True b. False Indicate whether the statement is true or false
The car lift in a gas station operates with an air pressure of 2000 kPa. The piston of the car lift has a diameter of 30.0 cm. What is the mass of the largest car that the lift can raise?
A. 8,750 kg B. 9,450 kg C. 10,300 kg D. 14,400 kg E. 17,500 kg