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A child and sled with a combined mass of 48.6 kg slide down a frictionless hill that is 8.94 m high. If the sled starts from rest, what is its speed at the bottom of the hill?
If a sample of gold with a mass of 2.857 g, is pressed into a leaf of 2.790 µm thickness, what is the area (in m^2) of the leaf?
The Moon is about 3.8 x 10^5 km from Earth. Show that its average orbital speed about Earth is 1026 m/s
One mole of oxygen gas is at a pressure of 6.70 atm and a temperature of 24.0°C. (a) If the gas is heated at constant volume until the pressure triples, what is the final temperature?
An equilateral triangle has sides of 0.14 m. Charges of -8.5, +8.0, and +1.6 µC are located at the corners of the triangle. Find the magnitude of the net electrostatic force exerted on the 1.6
(a) What is the magnitude of the electric field within the cell membrane? (b) Find the magnitude of the electric force that would be exerted on a potassium ion (K+; charge = +e) placed inside the me
Four point charges have the same magnitude of 2.4 x 10-12 C and are fixed to the corners of a square that is 8.2 cm on a side. Three of the charges are positive and one is negative. Determine the m
The four tires of an automobile are inflated to a gauge pressure of 1.7*10^5 Pa. EACH tire has an area of 0.023 m^2 in contact with the ground. Determine the weight of the automobile in Newtons.
A novice golfer on the green takes three strokes to sink the ball. The successive displacements are 4.00 m to the north, 2.00 m northeast, and 1.00 m at 30.0° west of south. Starting at the same
A severe thunderstorm dumped 2.5 in of rain in 30 min on a town of area 34 km2. What mass of water (in kg) fell on the town? One cubic meter of water has a mass of 10^3 kg.
Galileo made the first European observations of sunspots in 1610, and daily observations were begun in Zurich in 1749. At the present time we are well into the 23rd observed cycle. What is the frequ
A CD has a mass of 17 g and a radius of 6.0 cm. When inserted into a player, the CD starts from rest and accelerates to an angular velocity of 19 rad/s in 0.78 s. Assuming the CD is a uniform solid
The speed of a bullet as it travels down the barrel of a rifle toward the opening is given by v = (-5.00 × 107)t2 + (3.00 × 105)t, where v is in meters per second and t is in seconds. T
Two positive charges of 5.9 micro-Coulombs are placed on a horizontal surface with a coefficient of static friction of 0.75. If they are originally far apart and then one charge is slowly moved clos
A rod 16.0 cm long is uniformly charged and has a total charge of -21.0 µC. Determine the magnitude and direction of the electric field along the axis of the rod at a point 42.0 cm from its ce
What is the experience of a passenger aboard that space ship. Would he percieve time and his own aging, to have advanced through less than 4 hours? I assume that the time spent at near lightwpeed wo
Compare the three methods for distance. Explain in terms of length of backswing, speed at moment of release, and total distance used in applying force to ball before releasing it.
Snow is falling vertically at a constant speed of 9.0 m/s. At what angle from the vertical do the snowflakes appear to be falling as viewed by the driver of a car traveling on a straight, level road
Two very small spheres are initially neutral and separated by a distance of 0.62 m. Suppose that 9.3 x 1013 electrons are removed from one sphere and placed on the other. What is the magnitude of the
What must be the distance in meters between point charge q1 = 27.8 µC and point charge q2 = -68.7 µC for the electrostatic force between them to have a magnitude of 8.38 N?
Determine the acceleration and position of the bullet as a function of time when the bullet is in the barrel.
At t = 0, the rocket's speed is zero; at t = 1.0 s, its speed is 5.0 m/s; and at t = 2.0 s, its speed is 25 m/s. Plot a velocity vs. time graph for this motion, and use the graph to determine each
If the pendulum is 19.7 m in length, what is the least amount of time it takes for the bob to swing from a position of maximum displacement to the equilibrium position of the pendulum? (Assume that
When she skis in the direction opposite to that in which the wave moves, she springs upward every 0.420 s in response to the crests. The speed of the skier is greater than the speed of the wave. Det
A severe thunderstorm dumped 2.5 in of rain in 30 min on a town of area 40 km2. What mass of water (in kg) fell on the town? One cubic meter of water has a mass of 103 kg.