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a boat takes 3.00 hrs to travel 25.0 km down a river then 6.00 hrs to return. the car travels the same speed with respet to the water in both cases. how fast is the river moving (relaitive to teh shore ).
A crate of mass 45.0 kg is being transported on the flatbed of a pickup truck. The coefficient of static friction between the crate, What is the acceleration of the crate relative to the ground
A 2.6k and a 1.8k resistor are connected in parallel and this combination is connected in series with a 1.8k resistor. If each resistor is rated at 1/2W, what is the maximum voltage that can be applied across the whole network.
If the current in the solenoid increases uniformly from 0 to 4.1A in 0.70s , what will be the induced emf in the short coil during this time
A sample containing beryllium (atomic mass 9 u), aluminum (27 u), and an unknown element is placed in a mass spectrometer. What is the mass of the unknown element
A person exerts a horizontal force of F = 169N in the test apparatus. (h = 0.32m.) Find the horizontal force M that his flexor muscle exerts on his fore arm.
You want to contrast a physical pendulum with a period of 4.0s at a location where g= 9.8s/s^2.What length of simple pendulum having this period
Find out the magnitude and direction of the electric field at a distance.
a thin rod, of length L = 1.9m and negligible mass, that can pivot about one end to rotate in a vertical circle. A heavy ball is attached to the other end. find the initial height of the ball
An electron field of 8.50e5 V/m is desired between two parallel plates each of area 45cm^2 and seperated by 2.45 mm of air
a 1.5-kg object is attached to an ideal massless spring with a spring constant of 20 nN/M OSCILLATES on horizontal, Find the frequency of the oscillations
The spring shown in the figure is compressed 50 cm and used to launch a 100 kg physics student. How far up the incline does the student go
The cable below supports a unoformly distributed load. The max tension that the cable can withstand is 41 x 10^6 N, What minimum length of cable is needed
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