A hockey goalie is standing on ice. Another player fires a puck (m = 0.22 kg) at the goalie with a velocity of +63 m/s (a) If the goalie catches the puck with his glove in a time of 7.0 10-3 s, what is the average force (magnitude and direction) exerted on the goalie by the pu...
A person pushes a 16.0-kg shopping cart at a constant velocity for a distance of 26.0 m. She pushes in a direction 22.0° below the horizontal. A 38.0-N frictional force opposes the motion of the cart.
The National Aeronautics and Space Administration (NASA) studies the physiological effects of large accelerations on astronauts. Some of these studies use a machine known as a centrifuge. This machine consists of a long arm, to one end of which is attached a chamber in which t...
On a banked race track, the smallest circular path on which cars can move has a radius of 115 m, while the largest has a radius 165 m, as the drawing illustrates. The height of the outer wall is 18 m.
The drawing shows a circus clown who weighs 710 N. The coefficient of static friction between the clown's feet and the ground is 0.49. He pulls vertically downward on a rope that passes around three pulleys and is tied around his feet. What is the minimum pulling force tha...
Well, hard to imagine the picture, but by the description the wires each side are at 16 deg. back on each side of the tooth, i.e. each at 16 deg. to the face of the tooth. Each has 18N. tension. (sin 16) x 18 = 4.9608N. Double it (2 wires), = 9.9216N. back on the tooth.
A train at a constant 44.0 km/h moves east for 42 min, then in a direction 45.0° east of due north for 17.0 min, and then west for 51.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of it...
A room has dimensions 2.24 m (height) × 5.30 m × 6.55 m. A fly starting at one corner flies around, ending up at the diagonally opposite corner. (a) What is the magnitude of its displacement? (b) If the fly walks rather than flies, what is the length of the shortes...
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