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A sailboat runs before the wind with a constant speed of 3.7 m/s in a direction 32 degrees north of west. How far west has the sailboat traveled in 21 min ? How far north has the sailboat traveled in 21 min?
a park ranger wanted to measure the height of a tall tree. The ranger stood 9.50 m from the base of the tree, What is the height of the tree
Recent measurements show that the black hole at the center of the Milky Way galaxy, which is believed to coincide with the powerful radio source Sagittarius A*, What is the maximum radius of this black hole
Estimate the distance of GPS satellite from the ground.
Why is you are not harmed with the contact of a charged metal ball, although its voltage may be very high? Is the reason similar to why you are not harmed by greater-than-10000 C sparks from the Fourth-of-July sparkler? Define your answer in terms..
A copper strip (n = 8.47 1022 electrons per cubic centimeter) 2 cm wide and 0.07 cm thick is used to measure the magnitudes of unknown magnetic fields that are perpendicular to the strip. Find out the magnitude of B for the following Hall voltages..
A sensitive gravimeter at a mountain observatory finds that the free-fall acceleration is 9.00×10?3m/s2 less than that at sea level
To start an avalanche on a mountain slope, an artillery shell is fired with an initial velocity of 340 m/s at 47.0° above the horizontal, What are the x and y coordinates of the shell
The two 10-cm-long parallel wires are divided by 5.0 mm. For what value of the resistor will the force between the two wires be 1.08×10-4 N.
An inductor has a 53.6 ohm reactance when connected to a 60.0-Hz source, What is the maximum current in the inductor
The electron gun in a TV picture tube accelerates electrons between two parallel plates 1.5cm apart with a 27 kV potential difference between them.
A parallel-plate capacitor is made from two plates 12.5 cm on each side and 4.20 mm apart. Half of the space between these plates contains only air, but the other half is filled with Plexiglas of dielectric constant 3.40.
Speedy Sue, driving at 33.0 m/s, enters a one-lane tunnel. She then observes a slow-moving van 175 m ahead traveling with velocity 5.10 m/s. Sue applies her brakes but could accelerate only at -2.00 m/s2 because the road is wet. Will there be a co..
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