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A 20-kg mass is attached to a spring. If the frequency of the simple harmonic motion is 2/pi cycles, what is the spring constant k? What is the frequency of simple harmonic motion if the original mass is replaced with an 80-kg mass?
A 2200 kg car moving east at 10.0 m/s collides with a 3000 kg car moving north. Find the speed of the 3000 kg car before the collision
In 2.0 minutes, a ski lift raises 5 skiers at constant speed to a height of 140 m. What is the average power provided by the tension in the cable pulling the lift
Light traveling in air is incident on the surface of a block of plastic at an angle of 62.7o to the normal, Find the speed of light in the plastic
A rescue helicopter lifts a 84.2-kg person straight up by means of a cable. The person has an upward acceleration of 0.759 m/s2, What is the tension in the cable
A ball is thrown directly upward with an initial velocity of 10 m/s. how long is the ball in the air
An ancient club is found that contains 120.00 g of pure carbon and has an activity of 7 decays per second. Determine its age assuming that in living trees the ratio of 14C/12C atoms is about 1.10x10-12. Note that half life of carbon-14 is 5700 yea..
The voltage across a resistor is equal to the product of the current through the resistor and the resistance of the resistor, What is the potential difference of the battery
An electric field of 9.45 105 V/m is desired between two parallel plates, each of area 37.0 cm2 and divided by 2.45 mm of air. What charge must be on each plate.
An 6.70-cm-diameter, 300g sphere is released from rest at the top of a 1.60-m-long, 19.0 degree incline. What is the sphere's angular velocity at the bottom of the incline
A 135 mCi radioactive tracer is made in a nuclear reactor. When it is delivered to a hospital 18 hours later its activity is 85 mCi. The lowest usable level of activity is 10 mCi. What is the tracer's half-life
An 7.80 ball, hanging from the ceiling by a light wire 105 long, is struck in an elastic collision by a 2.20 ball moving horizontally at 5.00 just before the collision. Find out the tension in the wire just after the collision.
A system does 136 J of work on its environment and gains 66 J of heat in the process. compute the change in the internal energy of the system
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