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A student of mass m = 49 kg wants to measure the mass of a playground merry-go-round, which consists of a solid metal disk of radius R = 1.5 m that is mounted in a horizontal position on a low-friction axle. She tries an experiment: She runs with speed v = 6.5 m/s toward the outer rim of the merry-go-round and jumps on to the outer rim, as shown in the figure. The merry-go-round is initially at rest before the student jumps on and rotates at 1.3 rad/s immediately after she jumps on. You may assume that the student's mass is concentrated at a point. If it takes 36 s for the merry-go-round to come to a stop after the student has jumped on, what is the average torque due to friction in the axle?
A luminous object is 4.80m from a wall. You are to use a concave mirror to project an image of the object on the wall, with the image 2.23 the size of the object. How far should the mirror be from the wall?
A person running a fever has a body temperature of 39.4 degrees C What is the person's temperature on the Fahrenheit scale
A 10.0 kg crate is pulled up a rough incline with an initial speed of 1.5 m/s. The pulling force is 100. find the work done by the Earth's gravity on the crate
A uniform board is leaning against a smooth vertical wall. The board is at an angle above the horizontal ground. The coefficient of static friction between the ground and the lower end of the board is 0.620.
Ignoring the container and the equilibrium vapor pressure of the liquid at 51.5 °C, find out the ratio of the mass of steam to the mass of ice. The specific heat capacity of steam is 2020 J/(kg C°).
An RLC series circuit has R=1.35 kOhm, L=225 mH, and C=2.50 uF (micro farads) and is connected across a 60 Hz power supply. find the reactances of the capacitor and inductor
A copper block is removed from a 300°C oven and dropped into 1.00 kg of water at 20.0°C. What is the mass of the copper block
A 20,000 ohm resistor and a capacitor are connected in series and then a 15v potential differnce is suddenly applied across them. what is the capacitive value of the capacitor
The potiential energy of a + 2 * 10^-6 C charge decreases from 0.06J to 0.02J, What is the change in electric potiental between these two points
Sean climbs a tower that is 84.7 m high to make a jump with a parachute. what is the potential energy of Sean
The mean lifetime of stationary muons is measured to be 2.2 µs. Find the speed of these cosmic-ray muons relative to Earth
In a severe storm, 1.05 cm of rain falls on a flat horizontal roof in 31.0 min. obtain the average force exerted on the roof by the rain
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