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A ball on the end of a string is revolved at a uniform rate in a vertical circle of a radius 72.0 centimeter. If its speed is 4.0 m/s and its mass is 0.300 kilogram,
(a) Find the tension in the string when the ball is at the top of its path, and
(b) Find the tension in the string when the ball is at the bottom of its path.
A violinist is trying to tune her instrument to 512 Hz, but it is at 491. By what percent does she have to change the tension to tune the violin? Answer A) 1.2% B) 4.1% D) 8.7% E) 12.1% F) 14.5%
The emissivity of the human skin is 97.0 percent. Use 35.0 °C for the skin temperature and approximate the human body by a rectangular block with a height of 1.66 m, How much energy does our body lose in one second
A teenager pushes tangentially on a small hand-drivenmerry-go-round and is able to accelerate it from rest to afrequency of 17 rpm in 9.7 s. What is the torque required to produce the acceleration
An AC generator is to have a maximum output of 318 V. Each coil has an area of 0.145 m2 and a resistance of 15.7 ?, Find the maximum current induced in the coil
a single mass m1 3.6 kg hangs from a spring in a motionless elevator. the spring constant is k 294.0 nm. now three
how many electrons have been transferred. If a metric ton is 1.000 103 kg, how various 90 kg people can safely occupy an elevator that can hold a maximum mass of exactly 1 metric ton.
A circular armature coil is used in a motor with a uniform magnetic field of 1.80 T. The coil has a diameter 95 cm, how much current is flowing throught the motor
The windshield of a speeding car hits a hovering insect. Consider the time interval from just before the car hits the insect to just after the impact. Which of the following are right.
The classroom has a volume of about 100 m3. The pressure is atmospheric and the temperature is 75 ºF. What is the rms speed of the oxygen molecules
A hoop and a disk (both of mass 2 kg and radius of 0.3 m) roll without slipping up a straight incline with an initial velocity of 3.2 m/s. What is the maximum gain in height of the disk
The reflecting surfaces of two mirrors form a vertex with anangle of 130^\circ. If a ray of light strikes mirror 1 with an angle of incidenceof 48^\circ, find the angle of reflection of the ray when it leaves mirror2.
A window air conditioner unit absorbs 9.85 104 J of heat per minute from the room being cooled and in the same time period deposits 1.47 105 J of heat into the outside air. What is the energy efficiency rating of the unit
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