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Q. A 23.0 kg gold bar at 25.0°C is placed in a large, insulated 0.800 kg glass container at 15.0°C with 2.00 kg of water at 25.0°C. Estimate the final equilibrium temperature.
Q. A cardinal (Richmondena cardinalis) of mass 4.00×10-2 and a baseball of mass 0.143 have the equal kinetic energy. What is the ratio of the cardinal's magnitude of momentum to the magnitude of the baseball's momentum?
A jet is flying horizontally. when the plane is directly overhead at B, A person on the ground hears the sound coming from A. the average temperature of the air is 20 degrees celcius. if the speed of the plane at A is164 meters per second, what is..
The temperature of the glass surface of a 30 W light bulb is 75°C when the room temperature is 10°C. Estimate the temperature of a 150 W light bulb with a glass bulb the same size. Consider only radiation, and assume that 90% of energy is emitted as ..
A block of the same weight as the meter stick is suspended from the stick, as shown, at a distance x from the wall. What is the minimum value of x for that the stick will remain in equilibrium.
A rotating cylinder about 18km in length and 6km in diameter is designed to be used as a space colony. With what angular speed must it rotate so that residents on it will experience the same acceleration because of gravity on Earth.
A charge of -3.0 nC is at the origin and a second charge of 13.0 nC is at x = 8.00 m. Find the magnitude and direction of the electric field halfway in between the two charges.
A 4.0 kg block is released from rest at the top of a 30 degree frictionless incline. The block makes a head on elastic collision with another 3.0 kg block initially at rest on a horizontal surface at the bottom of the incline.
A cannon ball is fired horizontally with a velocity of 600 m/s from the top of a cliff 1000 m high.
The position of an air-track cart that is oscillating on a spring is given by the equation x = 12.4 cos[(6.35 s-1)t] . At what value of t after t= 0.00s in the cart first located at x = 8.47 cm ?
The depth of water behind the Hoover Dam in Nevada is 220 m. What is the water pressure at base of this dam? (Neglect the pressure due to the atmosphere.)
Two point charges have a total charge of 515 µC. When placed 1.15 m apart, the force each exerts on the other is 24.4 N and is repulsive. What is the charge on each.
The range of human hearing extends from approximately 20 Hz to 20000 Hz. Find out the wavelengths of these extremes while speed of sound in air is equal to 348 m/s.
Explain the velocity of two different objects: heavy rock & light feather. 1st, describe what happens when the two objects are dropped on Earth. 2nd, compare this to what happens on the Moon.
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