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An empty freight car of mass 8000 kg rolls at 5 m/sec along a level track and collides with a loaded car of mass 16,000 kg, standing at rest with its brakes released. If the cars couple together, find their speed after the collision. Also, find the decrease in kinetic energy as a result of the collision. Is the collision elastic or inelastic?
If you lie on the ground at night with no cover, you get cold rather quickly. Much of this is due to energy loss by radiation. Estimate the net rate at which your body loses energy by radiation to the night sky under these conditions
In a house the temperature at the surface of a window is 16°C. The temperature outside at the window surface is 9°C. Heat is lost through the window via conduction, and the heat lost per second has a certain value.
A fox fleeing from a hunter encounters a 0.795 m tall fence and attempts to jump it. By how much does the fox clear the fence
Two 125 W (122 V) lightbulbs are wired in series, How much power is dissipated by each bulb
Evaluate (a) the acceleration of each object, (b) the tension in the string, and (c) the coefficient of kinetic friction between m2 and the incline.
A sledge loaded with bricks has a total mass of 18.0 kg and is pulled at constant speed by a rope inclined at 19.6° above the horizontal. How much work is done by the rope on the sledge
Calculate the force required to pull a copper ball of radius 3.00 cm upward through a fluid at the constant speed 8.00 cm/s
Consider a binary star system in which the two stars have masses M1 and M2 and the stars move on circular orbits separated by a distance R
The radius of a park merry-go-round is 2.4 m. To start it rotating, you wrap a rope around it and pull with a force of 260 N for 11 s. What is the moment of inertia of the merry-go-round
A square loop of wire consisting of a single turn is perpendicular to a uniform magnetic field. The square loop is then re-formed into a circular loop, which also consists of a single turn and is also perpendicular to the same magnetic field.
The power of lightbulb is 100 Watts. I found the intensity of lightbulb which is about 812 Watt/m^2. Using these information, find the intensity of the Sun
The amplitude of an oscillator decreases to 68.7% of its initial value in 30.0s. What is the value of the time constant
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