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A boy pushes horizontally with a force of 210 Newton on a 40 kilogram crate to move it across a level ground. The coefficient of kinetic friction is 0.25.
(a) Evaluate what is the magnitude of the frictional force?
N
(b) Evaluate what is the magnitude of the crate acceleration?
m/s2
A rock is thrown vertically upward from ground level at time t = 0. At time t = 1.8 s it passes the top of a tall tower, What is the height of the tower
A rocket rises vertically, from rest, with an acceleration of 4.0m/s2 until it runs out of fuel at an altitude of 1400m. After this point, What maximum altitude does the rocket reach
Suppose a gas-filled incandescent light bulb is manufactured to have atmospheric pressure in it at 20.0°C. Find the gauge pressure inside such a bulb when it is hot
A car is moving with constant velocity v, and has wheels of radius R. At what angle does the piece of mud drop off the wheel
A police radar has an effective range of 1.3 km, while a motorist's radar detector has a rangeof 1.8 km. The motorist is going160 km/h in a 60km/h zone when the radar detector beeps. At what rate must the motorist decelerate to avoid a speeding ticke..
A private airplane left the airport at 1pm with speed 150 mph and its direction was 30 degrees east of north. At 3pm, the airplane reached point A and then changed its speed to 100 mph heading west. At 7pm, it reached point B.
on a frozen pond a 10kg sled is given a kick that imparts to it an intial speed of v0 2.0ms. the coefficient of the
A copper rod 87cm long is used to poke a fire. The hot end of the rod is maintained at 103%u2218C, What is the temperature of the rod 26cm from the cool end
A rectangular block of wood, 10 cm*15 cm*40 cm, has a specific gravity of 0.6. What fraction of the block is submerged
A 5.0kg block is put on top of a 6.5kg block. To cause the top block to slip on the bottom one, while the bottom one is held fixed, Find the resulting acceleration of the blocks
A transmission line is used to send power over a distance of 4.0 kilometer through a copper power line of 1.0Ω/km. Find how much power is lost in the transmission line
The Earth can produce the downward electric field of 150 N/C around its surface. Assume this electric field is uniform through the atmosphere. Estimate the net charge of the Earth
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