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Q. A 2 g lead (cp = 128 J/kg C) bullet traveling at 325 m/s is stopped by a large tree. If half the kinetic energy of the bullet is transformed into internal energy and remains with the bullet while the other half is transmitted to the tree, what is the increase in temperature of the bullet?
Q. Two identical metal spheres and are connected by a plastic rod. Both are initially neutral. 6.0×10^12 electrons are added to sphere , then the connecting rod is removed.
Afterward, what is the charge of?
Find out an angle of the velocity vector
Two carts with masses of 5.00 kg and 2.64 kg move toward each other on a frictionless track with speeds of 4.86 m/s and 3.46 m/s correspondingly. The carts stick together after colliding head-on. Find the final speed.
Problem on elevator
A somewhat longer cable replaces the old and is attached to the steel bar 5 m from its upper end, connecting to the same place on the wall as before and maintaining the same angle between the bar and the wall.
Define FM and what parameter of the intelligence signal causes frequency deviation of the carrier?
Estimate the thickness of lead shielding needed to reduce the exposure rate 2.5 m from a 5.92x10^11 Bq point source of Cs-137 to 1.0 mR/hr.
Imagine that the coefficient of kinetic friction between a certain 15kg box and the floor is 0.35. How hard would you have to push on it to move it at the constant speed of 2.6m/s across the floor.
Calculate the discharge in cubic meters per second and in cubic feet per second if A pipe with 2m diameter carries water having a velocity of 4 m/s.
A 17g rifle bullet travelling 220 m/s buries itself in a 3.90 kg pendulum hanging on a 3m long string, which makes the pendulum swing upward in an arc. Find out the vertical and horizontal components of the pendulum's displacement.
A uniform steel beam has a mass of 1640 kg. On it is resting half of an identical beam. What is the vertical support force at each end.
A floodlight with a mass of 46.00 kg is used to clarify the parking lot in front of a library. The floodlight is supported at the end of horizontal beam that is hinged to a vertical pole. A cable that makes an angle of 29 degrees with the beam is att..
Take the mass of the sun to be m_s = 1.99×1030 {rm kg}, gravitational constant to be G = 6.67×10-11 {rm N} cdot {rm m^2/kg^2}, and an acceleration due to gravity at the earth's surface to be g = 9.810 {rm m/s^2}.
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