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Q1. A thermos contains 175 cm3 of coffee at 85° C. To cool the coffee, you drop two 13-g ice cubes into the thermos. The ice cubes are initially at 0° C and melt totally. What is the final temperature of the coffee?
Q2. A shopper in a supermarket pushes a loaded 36 kg cart with a horizontal force of 12 N.
The acceleration of gravity is 9.81 m/s2.
Disregarding friction, how far will the cart move in 3.5 s, starting from rest?
Give answer in units of m.
Q3. The K-shell ionization energy of copper is 8979 eV. The L-shell ionization energy is 951 eV. Determine the wavelength of the Kα emission line of copper. What should be the minimum voltage be on an x-ray tube with a copper target in order to see the Kα line? (Imagine that the copper atom is in ground state.)
A 564 Hz sound wave travels through a substance. What is the speed of sound in the substance
A radio station broadcasts at a rate of 89.3 million cyces each second. what is the period of this wave and if the wavelength is 3.359 meters, what is the speed of this radio wave
Water flows out of a large open reservoir through a small pipe that opens to the atmosphere 30 m below the level of the water in the reservoir.
What are the rocket's horizontal range, greatest height, and total time of flight. The magnitude of the torque of this force on the door with respect to the hinge is most nearly .
a Hollow sphere of mass M=1000kg and radius R=25cm is rolling down of an incline plans making an angle with horizontal. calculate the angular acceleration of hollow sphere
What is an angular acceleration
A toroidal solenoid has a mean radius of 11.0 cm and a cross-sectional area of 5.00 cm2 and is wound uniformly with 100 turns. A second coil with 500 turns is wound uniformly on top of the first. What is the mutual inductance of these coils.
Suppose 1.0 mol of a monatomic ideal gas initially at 10 L and 307 K is heated at constant volume to 614 K, What is the efficiency of the cycle
linda pulls a sled with force 89 newtons at 30 degrees east of north. find the resultant force and direction
If the coefficient of static friction is 0.500, what minimum force magnitude is required from the rope to start the crate moving
What is diameter of the circle
Two police cars have identical sirens that produce a frequency of 560 Hz. Find the speed of the approaching police car
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