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A flight attendant pulls her 67 N flight bag a distance of 367 m along a level airport floor at a constant velocity. The force she exerts is 42 N at an angle of 55° above the horizontal. Find t
An 77 kg quarterback jumps straight up in the air right before throwing a 0.43 kg football horizontally at 15 m/s. How fast will he be moving backward just after releasing the ball?
What is the period of this pendulum in the small angle approximation? Answer in units of s.
When responding to sound the human eardrum vibrates about its equilibrium position. Suppose an eardrum is vibrating with an amplitude of 5.75x10-7 m and a maximum speed of 2.96x10-3
An engine absorbs 2224 J from a hot reservoir and expels 471 J to a cold reservoir in each cycle. What is the engine's efficiency?
A 1.40 102 kg crate is being pushed across a horizontal floor by a force P that makes an angle of 30.0° below the horizontal. The coefficient of kinetic friction is 0.250. What should be the mag
A robot probe drops a camera off the rim of a 402 m high cliff on Mars, where the free-fall acceleration is 3.7 m/s2. Find the velocity with which it hits the ground.
Suppose you have a semi-infinite solenoid, with radius R and n turns per unit length carrying a current I, running along the z-axis and extending from z = 0 to z = -∞. What is the magnetic fie
What is the magnitude of the external force necessary to hold a 2.0 kg cart motionless at the top of a 2.0m high incline which is 30 degrees?
A 12.0 g bullet is fired horizontally into a 102 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 154 N/m. The bullet b
A force is applied to a 3 kg mass and produces 5.4 m/s2 acceleration. What acceleration would be produced by the same force applied to a 6.9 kg mass?
What is the acceleration experienced by the tip of the 1.5 cm long sweep second hand on your wrist watch? In M/s^2
A camel sets out to cross the desert, which is 21.3 km wide in the north-south direction. The camel walks at the uniform speed 4.7 km/hr along a straight line in the direction 47.7? north of East (o
What is the acceleration of a falling crate (mass including parachute 132 kg) when the upward force or air resistance is one-fourth its weight
Suzie (of mass 60 kg) is roller-blading down the sidewalk going 18 miles per hour. She notices a group of workers down the walkway who have unexpectedly blocked her path, and she makes a quick stop
Our Sun rotates about the center of the Galaxy (MG 4. 1041 kg) at a distance of about 3. 104 light-years (1 ly = 3. 108 multiplied by 3.15 107 s/y multiplied by 1 y). What is the period of our orbi
How much force must you exert to keep the pole motionless in a horizontal position?
A penny of mass 3.1 g rests on a small 20 g block supported by a spinning disk. The coefficients of friction between the block and the disk are 0.75 (static) and 0.64 (kinetic) while those for the
An 854-kg (1887 lb) dragster, starting from rest, attains a speed of 27.1 m/s (60.7 mph) in 0.59 s. Find the average acceleration of the dragster during this time interval.
The loaded cab of an elevator has a mass of 3.0 103 kg and moves 218 m up the shaft in 23 s at constant speed. At what average rate does the force from the cable do work on the cab?
A pitcher throws a baseball at 41.0 m/s. If the ball thrown horizontally at this speed, how much will it drop by the time it reaches the catcher who is 17.0 m away from the point of release?
What is the net upward force on an airplane wing of area 20m^2 if the speed of flow is 320 m/s across the top of the wing and 305 m/s across the bottom of the wing?
A boy and a girl are riding on a merry go round which is turning at constant rate. The boy is near the outer edge, and the girl is closer to the center. Who has the greater tangential acceleration?
To explain why he seems to hang in the air, calculate the ratio of the time he is above ymax/2 moving up to the time it takes him to go from the floor to that height. You may ignore air resistance.
It hits the ground after an interval of 4.10 s. What is the potential difference between the starting point and the top point of the trajectory?