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Why did Aristarchus make his measurements of the sun's distance at the time of a half moon?
A 69-g handball moving with a speed of 4.3 m/s strikes the wall at an angle of 38° with the normal, and then bounces off with the same speed at the same angle with the normal. It is in contact
Sketch the wave at t = 0. (b) Find the angular wave number, period, angular frequency and wave speed of the wave. (c) Write an expression for the wave function y(x,t).
An 8.00 g bullet is fired into a 200 g block that is initially at rest at the edge of a table of 1.00 m height. The bullet remains in the block, and after the impact the block lands d = 1.6 m from
Which of these two seismic waves arrives at B first? (b)What is the time difference between the arrivals of the two waves at B? Take the radius of the Earth to be 6370 km.
An airplane with a wing span of 12 m flies horizontally and due north at a speed of 60 m/s in a region where the magnetic field of the earth is 60x10^-6 T directed 60 degrees below the horizontal.
The instant a traffic light turns green a car that has been waiting at the light starts forward with a constant acceleration of 10 ft/s^2. how fast willl the car be traveling
At room temperature (300 K) the effective density of states in the valence band is 2.66 × 1019 cm-3 for silicon and 7 × 1018 cm-3 for gallium arsenide. Find then corresponding effective
The piston moves until the volume of the gas is reduced to one-ninth of the initial volume. What is the final pressure of the gas when its temperature returns to its initial value?
The frictional force is negligible. The block starts from rest and moves a distance (x) in a time (t1). If the worker stops pushing at the end of (t1), how far does the block move in the next (t2)?
Calculate the speed of a satellite moving in a stable circular orbit about the Earth at a height of 3800 km.
If the cube floats so that it is 70% in the water and 30% in the oil, what is the mass of the cube? What is the buoyant force on the cube?
The edge of the raft is against the shore of the lake. The man walks toward the shore, the entire length of the raft. How far from the shore does the raft move?
A bottle containing 2kg of water at a temp. of 20°C is placed in refrigerator where the temperature is kept at 5°C. How much heat is transferred from the water to cool it to 5°C?
There are 6.3 multiplied by 1028 mobile electrons per cubic meter in tungsten. The cross-sectional area of the tungsten filament in bulb B1 is 0.01 mm2 (1 mm2 = 1 multiplied by 10-6 m2). The electr
The on axis magnetic field strength 5 cm away from a magnetic dipole is 1.0x 10000000 T . Wht is the size of magnetic dipole moment
A rectangular barge, 8 m long and 2 m wide, floats in fresh water. Find how much deeper it floats when its load is a 400 kg horse.
Describe your local and surrounding ecologies and environments. List the specific factors that distinguish your local ecology and environment.
An object weighing 346 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 310 N. Immersed in oil, the object weighs 325 N. Calculate the density
Does,doubling the distance between an individual and the source of radiation reduces the radiation exposure to one-fourth the original value.
Suppose in the figure that I1 = I2 = 24 A and that the separation between the wires is 0.015 m. What is the magnitude of the external field?
A player bounces a 0.34-{rm kg} soccer ball off her head, changing the velocity of the ball from initial velocity. If the ball is in contact with the player's head for 6.7 {rm ms}, what is the directi
A compass needle points 25 degrees E of N outdoors. However, when it is placed 17 cm to the east of a vertical wire inside a building it points 61 degrees E of N. What is the magnitude of the curren
Calculate the tension in a horizontal string that whirls a 2kg toy in a circle of radius 2.5m when it moves at 3 m/s on an icy surface.
A 3.0 cm tall object is 15 cm in front of a converging lens that has a 75 cm focal length. Calculate the image position and height. Compare with your ray-tracing in part a.