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Q. A student sits atop a platform a distance above the ground. He throws a pingpong ball horizontally with a speed . However, a wind blowing parallel to the ground gives the pingpong ball a constant horizontal acceleration with magnitude . This results in the pingpong ball reaching the ground directly under the student.
Q. A sled weighing 189 N rests on a 15° incline, held in place by static friction. The coefficient of static friction is 0.50.
(a) What is the magnitude of the normal force on the sled?
(b) What is the magnitude of the static friction on the sled?
(c) The sled is now pulled up the incline at constant speed by a child. The child weighs 431 N and pulls on the rope with a constant force of 100 N. The rope makes an angle of 30° with the incline and has negligible weight. What is the magnitude of the kinetic friction force on the sled? (Enter 0 if sled does not move.)
(d) What is the coefficient of kinetic friction between the sled and the incline? (Enter 0 if sled does not move.)
(e) What is the magnitude of the force exerted on the child by the incline?
A 346-, uniform, 1.04- bar is suspended horizontally by two vertical cables at each end. Cable A can support a maximum tension of 506.0 without breaking, and cable B can support up to 436.0. You want to place a small weight on this bar. What is the h..
Write down a function named as kineticEnergy() which determines the kinetic energy of an object in accordance with the following formula.
A 53 kg woman and a 80 kg man stand 13 m apart on frictionless ice. If they hold on to two ends of a rope, and the man pulls on the rope so that he moves 3m, how far from the woman will he be now.
A charge of 3.80 10-6 C is placed on a small conducting sphere that is located at the end of thin insulating rod whose length is 0.22 m. The rod rotates with an angular speed of ω = 156 rad/s about an axis that passes perpendicularly through its o..
A 27 pound meteorite struck a car, leaving a dent 26cm deep in the trunk. If the meteorite struck the car with a speed of 620m/s, what was the magnitude of its deceleration, assuming it to be constant.
An object with a net charge of 44 µC is placed in a uniform electric ?eld of 554 N/C, directed vertically. The acceleration of gravity is 9.81 m/s^2. What is the mass of this object if it ?oats in this electric ?eld?
Determine the coefficient of kinetic friction between the block & the table.
A stone takes 0.28s to travel past a window 2.2m tall. From what height above top of the window did the stone fall?
A 25 g of copper pellets are removed from a 300 C oven and immediately dropped into 120 mL of water at 18 C in an insulated cup. What will the new water temperature be.
A 66 {rm kg} skier speeds down a trail, as shown in the figure . The surface is smooth and inclined at the angle of 22 ^circ with the horizontal. Find the magnitude of the net force acting on the skier.
An electric water heater holds 165L. If electricity costs 0.18 per , how much does it cost to raise the water temperature from 10 to 60.
A board is 6 meters long. The center of mass is in the 2 meters from the left end. The board has a weight of 320 Newton's. How much force in Newtons is necessary to lift the right end while the other end stays on the ground.
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