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Q. A coffee filter of mass 1.4 grams dropped from a height of 3 m reaches the ground with a speed of 0.7 m/s. How much kinetic energy Kair did the air molecules gain from the falling coffee filter? Start from the Energy Principle, and choose as the system the coffee filter, the Earth, and the air.
Q. A small block is at rest on the floor at the front of a railroad boxcar that has length . The coefficient of kinetic friction between the floor of the car and the block is µk. The car, originally at rest, begins to move with acceleration a. The block slides back horizontally until it hits the back wall of the car. (Use L for , mu for µk, and a and g as appropriate in your equations.) (a) At the moment it hits, what is its speed relative to the car? (b) At the moment it hits, what is its speed relative to the Earth?
What mass (in grams) of steam at 100 °C must be mixed with 287g of ice at its melting point, in a thermally insulated container, to produce liquid water at 65°C? The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg, an..
find the magnitude and direction of the impulse delivered to the ball by the floor.
The radius of Venus's orbit is 0.72 times that of Earth's orbit. How much stronger is the Sun's gravitational field at Venus than at the earth.
A 4.70 kg mass causes a vertical spring to stretch 0.850 meters. The spring is after that stretch and extra 0.270 meters and release (as a stopwatch starts) causing the spring and mass to oscillate.
Every day our Earth receives 1.55×1022 J energy from the Sun. If we were able to use 0.85 percent of this energy to accelerate spaceships, then how various missions will be possible in one year.
Before starting this problem, review Conceptual. The force vector A has the magnitude of 75.0 newtons (N) and points due east. The force vector B has a magnitude of 101 N and points 72.9 ° north of east.
A 36.4 kg child starting from rest slides down a water slide with the vertical height of 20.7 m. (Neglect friction.) What is the child's speed three-quarters of the way down.
Two children tug on a toy of mass 2.0 kg. Costa pulls with a force of 10.0N [W 30degrees S]. The toy slides with an acceleration of 2.5 m/s^2 in the direction of the net force.
A 68 kg person sits on a 4.0 kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.2 cm in diameter . Find the pressure exerted on the floor by each leg of the chair, assume the weight is evenly distributed.
A race car starts from rest on the circular track of radius 455m. The car's speed increases at the constant rate of 0.480m/s2. At the point where magnitudes of the centripetal and tangential accelerations are equal.
A weightlifter has been given a barbell to lift. One end has a mass of 5.05 kg while the other end has a mass of 5.20 kg. The bar is 0.20 m long. (Consider the bar to be massless, and assume that the masses are thin disks, so that their centers of ma..
What is the propotion of the mass of these excess electrons to the mass of the penny.
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