A block of weight W is pulled along a horizontal surface at a constant speed v by a force F, which acts an angle theta with the horizontal, as shown to the left. The normal force exerted on the block by the surface has magnitude A) greater than zero but less than W

B) Equal to W

C) Zero

D) greater than W

Transfer chemicals from one location to another to weather objects. a-water b-physical weathering c-chemical weathering

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.