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1)A crate of potatoes of mass 19.0 kg is on a ramp with angle of incline 30° to the horizontal. The coefficients of friction are μs = 0.82 and μk = 0.29. Find the frictional force (magnitude and direction) on the crate if the crate is sliding down the ramp. 2) A car travels east at 89 km/h for 5.0 h. It then travels 45.0° east of north at 105 km/h for 5.0 h. (a) What is the average speed for the trip? (b) What is the average velocity for the trip? magnitude direction ° north of east 3)A block of mass m1 = 4.0 kg rests on a frictionless horizontal surface. A second block of mass m2 = 2.2 kg hangs from an ideal cord of negligible mass that runs over an ideal pulley and then is connected to the first block. The blocks are released from rest. (a) Find the acceleration of the two blocks after they are released. block 1: magnitude m/s2 direction block 2: magnitude m/s2 direction (b) What is the velocity of the first block 1.1 s after the release of the blocks, assuming the first block does not run out of room on the table and the second block does not land on the floor? magnitude m/s direction (c) How far has block 1 moved during the 1.1-s interval? m (d) What is the displacement of the blocks from their initial positions 0.10 s after they are released? block 1: magnitude m direction block 2: magnitude m direction
A car is being pulled out of the mud by two forces that are applied by the two ropes shown in the drawing. The dashed line in the drawing bisects the 30.0° angle.
A reflecting telescope has a main mirror with fM = 620 mm. If an eyepiece with a magnification of 15 is used, what is the total magnification of the telescope
Like all stars, our sun converts mass into energy which radiates (spherically) in all directions. Calculate the rate at which the sun is losing mass
A positive point charge q1=2.5x10^-5C is fixed at the origin of corrdinates and a negative charge Q2=-5x10^-6C is fixed to the x axis at x=+2m
A playground merry-go-round has radius 2.90m and moment of inertia 2500kg?m2 about a vertical axle through its center, and it turns with negligible friction. How much work did the child do on the merry-go-round
What is the charge before the Teflon is removed? B.)What is the potential difference before the Teflon is removed, What is the charge after the Teflon is removed
7.5 mol of helium are in a 18 L cylinder. The pressure gauge on the cylinder reads 67psi, What are the temperature of the gas in Celsius and the average kinetic energy of a helium atom
Find the difference in decibel levels β1 & β2 of a sound source is related to the ratio of its distances r1 & r2 and find the average power generated by the horn.
A supermassive black hole passes through the edge of the solar system 1.20 x 10^13 m away. What is the mass of the black hole
Discover the tensions in the rope
Two metal spheres, each of mass 14 g and initially at rest, are dropped from a height of 6 m in an evacuated chamber. One sphere has a charge of +50 ?C, and the other has a charge -50 C.
Place a 2kg textbook against a vertical wall and press on it with a force of 40 N. determine the acceleration of the textbook
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