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Questions (21)
The lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head,
1 answer
1,116 views
A jet plane is flying with a constant speed along a straight line, at an angle of 30.0° above the horizontal, as shown in part
1 answer
1,715 views
The drawing shows box 1 resting on a table, with box 2 resting on top of box 1. A massless rope passes over a massless,
0 answers
1,296 views
A helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 112-kg laser sensor which measures the
1 answer
4,053 views
Two bars of identical mass are at 30 °C. One is made from glass and the other from another substance. The specific heat
1 answer
6,260 views
A mass m = 0.068 kg of benzene vapor (Lv = 3.94x105 J/kg) at its boiling point of 80.1°C is to be condensed by mixing with
1 answer
3,192 views
A cable is lifting a construction worker and a crate, as the drawing shows. The weights of the worker and crate are 833 N and
0 answers
740 views
Starting from rest, a 1.6x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts
1 answer
963 views
A 0.662-kg basketball is dropped out of a window that is 6.32 m above the ground. The ball is caught by a person whose hands are
1 answer
558 views
A semi-trailer is coasting downhill along a mountain highway when its brakes fail. The driver pulls onto a runaway truck ramp
2 answers
710 views
Two balls are approaching each other head-on. Their velocities are +11.9 and -10.5 m/s. Determine the velocity of the center of
0 answers
1,084 views
An automobile has a mass of 1520 kg and a velocity of 19.7 m/s. It makes a rear-end collision with a stationary car whose mass
0 answers
646 views
A piece of metal, when weighed in air, has a weight of 20.7 N. When completely submerged in blood (ĉ = 1060 kg/m3), the metal
1 answer
855 views
A 48.0 kg child is stationary in the middle of an ice rink (no friction). A 0.750 kg football is thrown with a velocity of 21.2
1 answer
722 views
In a football game, a receiver is standing still, having just caught a pass. Before he can move, a tackler, running at a
1 answer
625 views
A cart is driven by a large propeller or fan, which can accelerate or decelerate the cart. The cart starts out at the position x
1 answer
4,000 views
(a) What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 8.02 m/s when going
1 answer
1,271 views
A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 3.71 m/s. The car is a
1 answer
529 views
Vector A has a magnitude of 71 units and points due west, while vector B has the same magnitude and points due south. Find the
2 answers
2,482 views
A 34.1 kg child rides a Ferris wheel whose diameter is 18.3 m. When the ride is turning at a constant rate, the child’s speed
1 answer
681 views
A 13,900 kg truck is moving at 23.5 m/s on a mountain road when the brakes are applied. The brakes FAIL!! Fortunately, the
1 answer
621 views
