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Q. A river flows at a speed vr = 4.17 km/hr with respect to the shoreline. a boat needs to go perpendicular to the shoreline to reach a pier on the rivers other side. to do so the boat heads upstream at an angle theta = 30 from the direction to the boats pier. find the ratio of vb to vr, where vr is defined above and vb is the boats speed with respect to the water.
Q. A circular loop in the plane of the screen lies in a 0.87 T magnetic field pointing into the screen. If the loop's diameter changes from 19.5 cm to 6.0 cm in 0.50 s, determine the following.
(a) What is the magnitude of the average induced emf?
(b) If the coil resistance is 2.5 , what is the average induced current?
The springs of a 1400 kg car compress 6.0 mm when its 68 kg driver gets into the driver's seat. If the car goes over a bump, what will be the frequency of vibrations.
Two people with a combined mass of 120kg hop into an old car with worn-out shock absorbers. This causes the springs to compress by 8.30 cm. When the car hits a bump in the road, it oscillates up and down with a period of 1.70s.
How much does the rocket clear the top of the wall
A massless string is wrapped around a solid disk of mass m_1 and tied to a block of mass m_2. The disk is free to rotate on a frictionless horizontal axle.
one end of a uniform beam of 222N is hinged to a wall, the other end is supported by a wire that makes angles of 30 with both wall and beam, find out the tension in the wire and horizontal and vertical componentes of the force od the hinge on the ..
An ideal gas at 20 C consists of 2.2 X 10^{22} atoms. 4.3 J of thermal energy are removed from the gas. What the new temperature in C.
A 1.20 liter flask contains a certain quantity of ideal gas at 305 K. next an equal number of molecules of the same gas are added to the flask, after which the absolute pressure is 1.30 times its original value. What is the final temperature.
A 1kg ball released from horizontal attatched to a 2.5 m string collides ellastically with a 2 kg block at rest. what is the speed of the block after the collision.
A 11.0g bullet is fired horizontally into a 103g wooden block that is firstly at rest on a frictionless horizontal surface and connected to a spring of constant 154N/m. The bullet becomes embedded in block. If the bullet-block system compresses the s..
A crate is pulled by a force (parallel to the incline) up a rough incline. The crate has an initial speed of 1.5m/s. The crate is pulled a distance of 7.5 m on the incline by a 150 N force. The acceleration of gravity is 9.8m/s² mu=0.15
Starting from rest, a speedboat reaches a speed of 2.30 m/s in 1.2 s. What is the boat's speed after an additional 2.50 s has elapsed, assuming the boat's acceleration remains the same.
A magnetic field near the ceiling points up and is decreasing. Looking up at the ceiling, does non-Coulomb electric field curl clockwise or counter-clockwise.
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