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A 7 kg sled is initially at rest on a horizontal road. The sled is pulled a distance of 3.5 m by a force of 37 N applied to the sled at an angle of 30o to the horizontal. Find the change in the kinetic energy of the sled.
A boat moves through a river at 7-m/s relative to the water, regardless of the boat's direction. If the water in the river is flowing at 3.50m/s, how long does it take boat to make a round trip consisting of a 250 m displacement downstream followe..
A kangaroo can jump over an object 2.6 m high. Calculate its vertical speed when it leaves the ground
A cat is trying to jump onto a countertop that is 1m tall from 0.3m away. The cat's initial jump speed (magnitude of the total initial velocity) is 10m/s
A 0.840-kg block oscillates on the end of a spring whose spring constant is k= 42.0 N/m . The mass moves in a fluid which offers a resistive force F=-bv, where b = 0.640 N*s/m. What is the fractional decrease in amplitude per cycle?
When the plunger is pushed, contents of the syringe are forced throughout a hollow needle (also of circular cross-If a 4.0 N force is applied to plunger and diameters of the plunger and the needle are 1.20 cm and 2.50 mm, correspondingly, what force ..
The charges and coordinates of two charged particles held fixed in the xy plane are: q1=2.90 ?C, x1=3.900 cm, y1=8.700 cm, What are the x and y coordinates of a third charge q3=3.00 ?C
A meter stick is supported on a fulcrum at the 21 cm mark. A 0.80 kg object is hung from the zero end of the meter stick, What is the mass of the meter stick
A 65- kg child sits in a swing suspended with 3.4- m-long ropes. The swing is held aside so that the ropes make an angle of 60 o with the vertical
John can hit a golf ball 310m on earth. on the moon's surface, g=1/6 gravity of earth, so how far could he hit the same ball if he could only achieve half an initial velocity achieved on earth.
While looking into a silver Christmas ornament, If your nose is only 6.25 inches from the ornament, and the diameter of the ornament is 4.85 cm, how far behind the ornament does your nose appear
A circular loop of wire of radius 0.50 m is in a uniform magnetic field of 0.30 T. The current in the loop is 2.0 A. What is the magnetic torque when the plane of the loop is perpendicular to the magnetic field
In a television set the power needed to operate the picture tube comes from the secondary of a transformer. Find the turns ratio Ns/Np of the transformer
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