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Question1
A bridge truss extends 200m across a river. The structure is free to slide horizontally to permit thermal expansion. The structural components are linked by pin joints and the masses of the bars are small compared with the mass of a 1360 kg car at the center. Compute the force of tension or compression in each structural component.
Question2
Experiencing a constant horizontal 1.10 m/s wind, a hot-air balloon ascends from the launch site at a constant vertical speed of 2.70 m/s. At a height of 202 m, balloonist maintains constant altitude for 10.3 s before releasing a small sandbag. How far from the launch site does the sandbag land.
Question3
develop an equation for the radius r of the circular path that the electrons follow in terms of the magnetic field B, the electrons' velocity v, charge e, and mass m. suppose that the electrons move at right angles to the magnetic field.
An inductor has a 53.6 ohm reactance when connected to a 60.0-Hz source, What is the maximum current in the inductor
A 7430-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. Find the work done by the gravitational force
A concave spherical mirror with a focal length of 15cm forms an upright image that is 5 times larger than the original object
An individual is running around a turn with an 11 m radius at 3.75 m/s. What is the runner's centripetal acceleration
Jone pulls her brother on a sled over a horizontal surface with force of 80N. The force is at an angle of 25 degree, determine the acceleration of the sled
As a rocket passes the earth at 0.75c, it fires a laser perpendicular to its direction of travel, What is the speed of the laser beam relative to the earth
One of your friends pulls on a rope with 3 units of force and other pulls on a second rope with 5 units of force, How hard and what direction must you pull
F = G.Mm/r2 where F is the gravitational force, M and m are masses, and r is a length. Force has the SI units kg · m/s2. What are the SI units of the proportionality constant G
A star is moving away from Earth at a speed of 2.3x10^8 m/s. find the wavelength as measured by an Earth observer
A building has two open doors facing the bay. The walls of the building absorb sound well, so multiple reflections can be ignored. find the distance d between the door centers
A man in a restaurant asked a waiter for a juice glass, a dinner plate, water, a match, and a lemon wedge. How did the waiter get the water into the glass
A hurricane-force wind of 220 blows across the face of a storefront window. Estimate the force on the 2.2 3.5 window due to the difference in air pressure
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