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Q. A flight attendant pulls her 67N flight bag a distance of 367m along a level airport floor at a constant velocity. The force she exerts is 42N at an angle of 55° above the horizontal. Find the coefficient of kinetic friction between flight bag and floor.
Q. A spool of thin wire rotates without friction about its axis. A man pulls down on a wire connected to an inner radius with force of 16.10 N. How long does it take to enlarge the angular velocity of the spool from 11.00 rad/s to 39.00 rad/s? Icm = 0.790 kgm2 Inner radius, r = 0.3400 m Outer radius, R = 0.5600 m.
Consider the similar spool as in the previous problem. Now, in its place of pulling on the wire, the man attaches the wire to the mass of 0.820kg. The man lets go of the mass, and the spool starts to turn. What is the speed of the mass after it has travelled downward the distance of 0.460m? (Assume there is no energy lost to friction.)
The expression found in part (d) is a cubic equation. There are standard algebraic solutions to this type of equation, but it is sometime quicker and easier to use other methods. explain a way to get a reasonably accurate estimate of v (say, to th..
An automobile travels on a straight road for 40.0 km [E] at 30.0 (km/h). It then continues in the same direction for another 40.0 km [E] at 60 (km/h). Estimate the average speed, distance, displacement, & average velocity for the trip.
The total mechanical energy of the spacecraft, assume that the gravitational potential energy is zero at an infinite distance from the Earth.
How much work done against force of gravity
If a car traveling at 66 km/h will skid 22 m when its brakes lock, how far would it skid if it is traveling at 120 km/h when its brakes lock.
A 790-kg object and an 889-kg object are separated by 11.0 m. At what position (from the less massive object) can the 260-kg object be placed so as to experience a net force of 10 N towards the less massive object.
The 2.00 kg object below is released from rest at the height of 5.0 m on a curved frictionless ramp. At the foot of the ramp is a spring of force constant k = 450 N/m. The object slides down the ramp and into the spring, compressing it a distance x b..
By how much does the ball clear the net. How far below top surface would the medallion appear if the observer (not wearing goggles) and the block were under water.
Once the station is completed, it is set rotating at a rate that requires an object at the rim to have radial acceleration, thereby simulating Earth's surface gravity. This is accomplished using two small rockets, each with 130 thrust that are mounte..
To store the energy produced in 1hour by a 110 electric power plant, how many cubic meters of water will have to be pumped from the lower to the upper reservoir? Suppose the upper reservoir is 510 meters above the lower one, and we can neglect the sm..
Far in space, where gravity is negligible, a 485kg rocket traveling at 95.0m/s fires its engines. It shows the thrust force as a function of time. The mass lost by the rocket during these 30 s is negligible.
A skateboarder shoots off a ramp with a velocity of 6.4 m/s, directed at an angle of 55° above horizontal.
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