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The machine should extert 200 lbs force to prevent the boulder from rolling down the hill. a. If boulder weighs 500 lbs, find hill's incline angle? b. If boulder weighs 1000 lbs, find hill's incline
Is the gravitational force applied on the Moon by the Earth and the Sun greater throughout a solar eclipse or a lunar eclipse? Explain why? Compute the two forces.
Determine the magnitude of the electric field at the point (7.80 i - 3.40 j + 6.00 k) m when the electric potential is given by V = 4.10xyz2, where V is in volts and x, y, and z are in meters?
If elliptical pattern of the whispering gallery is 92 feet long by 58 feet wide, how far from whisperer at 1 focus is listener at other focus?
Suppose an asteroid's moon is 1.3 km wide, and that its center is 100 km from the center of the asteroid, that is 55 km long. The moon's orbit is circular having a period of 20 h. The volume of ast
Find out the direction of the velocity of the third fragment instantly after the explosion. Find out the energy free in the explosion.
Determine the maximum compression of the spring? Determine the final velocities of the blocks after the collision? Is the collision elastic? Avoid the mass of the spring.
Dish antennas have the parabolic cross-section. This concentrates signals onto the sensor at focus of parabola. The dish antenna is 1 m wide and 20 cm deep. How far from bottom of the dish must sens
The plane of a rectangular loop of wire having a width of 5.0 cm and a height of 8.0cm is parallel to the magnetic field of magnitude 0.23T. The loop carries a current of 6.9A. i) Determine what tor
Certain neutron stars (very dense stars) are believed to be rotating at around 10 rev/s. When such a star has a radius of 18 km, determine what should be its minimum mass so that material on its sur
Find equation of the parabola which estimates shape of Gateway arch? Suppose that origin of coordinate system is at ground level midway between legs of arch. Write equation in standard form.
The armature of a small generator comprises of a flat, square coil having sides of length L and with N turns. The coil rotates in a magnetic field of magnitude B. Determine the angular speed of the
When the two sides are at different temperatures, determine how might heat transfer from one side to the other? Note that our asteroid doesn’t encompass enough gravity to hold an atmosphere.
A bike tire having a moment of inertia I = 0.35 kg m2 consists of an initial angular speed of 13 rev/s and makes 7.3 revolutions before coming to rest. Determine how long was the tire rotating?
A laser produces a cylindrical beam of light 3.4 mm in diameter having an average power of 3.1 mW. (i) When the laser is shined on a perfectly absorbing surface, determine how much energy does the sur
Both objects were liberated from the similar position at the top of the ramp. When the speed sphere of the solid sphere at the bottom of the ramp was 1.65 m/s, determine what would be the speed cyli
The rotational speed of the automobile engine is raised at a constant rate from 1100 rev/min to 4300 rev/min in 14 s. (i) Determine its rotational acceleration in revolutions per minute-squared?
Stock market tripled in 10 years. a) Find average change per year over those 10 years b) In first five years it went up 90% (not 90% per year-90% total). How much it went up in second five years?
A light-bulb of 120 W joined to a 120-V source experiences a voltage surge which generates 137 V for a moment. By what percentage does its power output increase? Suppose its resistance doesn’t
A certain waffle iron is rated at 0.58 kW if joined to a 120 V source. (i) Determine current does the waffle iron carry?
Determine the magnetic flux via the coil before it is rotated. Determine the net magnetic flux via the coil after it is rotated?
When free, it starts to rotate about its center having an initial angular acceleration of 7.87×103 rad/s2. Determine the magnitude of the magnetic field
In an experiment performed at the bottom of an extremely deep vertical mine shaft, a ball is tossed vertically in the air having a known initial velocity of 10 m/s and the maximum height the ball re
The light of wavelength 590 nm passes via two narrow slits 0.60 mm apart. Each and every slit is 0.2 mm wide. The screen is 1.7 m away. (i) Determine how far away on the screen is the 4th interferen
The airplane is sighted at same time by two ground observers who are 2 miles apart and in line with airplane. They report angles of elevation as 10 degrees and 22 degrees. Compute how high is airpl