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A dart with mass m moving horizontally imbeds in a target of mass M suspended by a wire of length l and mass u.
a) What is the initial speed of the dart v if immediately after impact the target recoils with angular speed w?b) Compute v from part a) if m=30g, M=1kg, u=40g, l=3m and w=0.15 rad/s
What is the greatest mass that can be accelerated upwards at 2.9 m/s2 if the stress in the cable is not to exceed the elastic limit of the cable, that is 2.2 108 Pa.
a refrigerator maintains an interior temperature of 4 degree c while the temperature near its heat exhaust is 30 degree
Calculate the capacitance of a capacitor whose plates a 20.0 cm by 3.0 cm and are separated by a 1.0mm air gap. What is the charge on each plate if the capacitor is connected to a 12.0 V battery
A wire carries current to the north (towards the top of the computer screen) through a magnetic field. what is the direction of the magnetic force on the current-carrying wire
an airliner is cruising at a ground speed of 450 knots. a flight attendant serving drinks accidentally knocks a bottle
An electron is at rest just above the surface of a sphere with the radius of 1.90 mm and a uniformly distributed positive charge of 2.1 x10-15 C.
An object of heat capacity 100 cal/C is initially at 30.0C. Estimate the resulting entropy change of the universe
a racetrack has the shape of an inverted cone as the drawing shows. on this surface the cars race in circles that are
A cylinder contains 2.15 mol of helium gas at 22.5°C. Assume that the helium behaves like an ideal gas. Find the total internal energy of the system
In this problem you will consider the balance of thermalenergy radiated and absorbed by a person. Assume that the person is wearing only a skimpy bathing suit of negligible area. how much thermal power P does the human body radiate
A mass of 20 kg is attached to a light string which is wrapped around a cylindrical spool of radius 10 cm and moment of inertia 2 kg.m^2. How long does it take to reach the floor
A proton moves at a speed of 870 m/s in a direction perpendicular to a magnetic field with a magnitude of 0.70 T
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