A rectangular box of negligible mass measures 5.0 m long, 1.0 m wide, and 0.50 m high. How many kilograms of mass can be loaded onto the box before it sinks in a lake having water of density 1000 kg/m3?
A) 1.5 × 103 kg B) 2.5 × 103 kg C) 0.50 × 103 kg D) 3.5 × 103 kg
B
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Uniform Circular Motion: When a car goes around a circular curve on a horizontal road at constant speed, what force causes it to follow the circular path?
A. the normal force from the road B. the friction force from the road C. gravity D. No force causes the car to do this because the car is traveling at constant speed and therefore has no acceleration.
A 6.0 kg box slides down an inclined plane that makes an angle of 39° with the horizontal. If the coefficient of kinetic friction is 0.19, at what rate does the box accelerate down the slope?
A) 4.7 m/s2 B) 5.2 m/s2 C) 5.5 m/s2 D) 6.2 m/s2
If, from the point of view of Earth-bound observers, the Moon is in new Moon phase on a particular day, what phase is Earth as seen from the Moon?
What will be an ideal response?
The value 1.38 × 10^-23 J/K is known as:
a. the universal gas constant. c. Avogadro's number. b. Boltzmann's constant. d. the molar specific.