Question

• A block of limestone having a volume of 1.00 x 10-3 m3 has a mass of 2.711 kg. A stone mason shapes the block into a sphere having a radius of 5.00 cm. What is the mass of the sphere?
• A car drives 50.0 km due south. Then it turns onto another highway and drives 70.0 km in a direction 40.0o south of east. How far is the car from the place it started?
• A car accelerates from an initial speed of 20.0 m/s with an acceleration of 1.25 m/s2. After the car has traveled 150 m, how fast is the car moving?
• A spelunker drops a rock down a crevice and measures the time for it to make a splash in a pool below. If the rock takes 0.750 s to reach the pool, how far did it fall?
• An archer shoots an arrow into the air with an initial speed of 30.0 m/s at an angle of 50.0o to the horizontal. As it falls back toward the ground, the arrow lodges in a tree 86.8 m away. How far above the arrow’s initial height does the arrow lodge in the tree?
• The tip of a helicopter’s rotor blade moves in a circle 8.23 m in radius with an angular speed of 258 revolutions per minute. What is the centripetal acceleration of the tip of the blade?
• A 7.00 kg drawer is pulled open with a force of 12.0 N. If the frictional force opposing the motion of the drawer is 2.50 N, what is the acceleration of the drawer?
• A weightlifter lifts a 800 N barbell with an upward acceleration of 2.25 m/s2. What upward force does the weightlifter exert on the barbell?
• Starting at rest, a two-man bobsled team pushes a 390 kg bobsled to a final speed of 11.0 m/s while traveling 50.0 m. What net force acts on the bobsled?
• A physics book with a mass of 2.50 kg rests on a large sheet of newsprint on a horizontal surface. The coefficient of static friction between the book and the newsprint is 0.400. What maximum acceleration can be given to the book by pulling in a horizontal direction on the sheet of newsprint without the book sliding across the newsprint.

Answer 1