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Three blocks are attached to each other via ropes and pulleys as shown. Assume the pulleys are frictionless and the string is massless. what is the acceleration of the middle block? What are the tensions in the strings?
A cart is driven by a large propeller or fan, which can accelerate or decelerate the cart. Find the acceleration of the cart
a system of 1435 particles, each of which is either an electron or a proton , has a net charge of -7.216x10^-17, how many electrons are in this sytem
An office window has dimensions 3.5 m by 2.3 m. As a result of the passage of a storm, What net force pushes out on the window
A 5* 10^2 kg hot air balloon takes off from rest at the surface of the earth. The non conservative wind and lift forces take the balloon up, doing +9.70*10^4J of work on the balloon in the process. At what height above the surface of earth does th..
A 70 kg astronaut floating in space in a 110 kg MMU (manned maneuvering unit) experiences an acceleration of 0.029 m/s2 when he fires one of the MMU's thrusters. What is the thrust of the thruster
What is the final speed of the crate after being pulled. On a very muddy football field, a 100 linebacker tackles an 80 halfback. Immediately before the collision, linebacker is slipping with a velocity of 8.5 north and the halfback is sliding with..
A person wearing a safety belt can withstand an acceleration of -3.0 x 10^2 m/s2. How thick must barriers be to safely stop a car that hits a barrier at 112 km/h.
Two dogs pull horizontally on ropes attached to a post; the angle between the ropes in 69.0 degrees, Find the angle the resultant force makes with the rope of dog A
A farm truck moves due east with a constant velocity of 9.50m/s on a limitless, horizontal stretch of road. A boy riding on the back of the truck throws a can of soda upward and catches the projectile at the same location on the truck bed, but 16.0m ..
The ceiling of a classroom is 3.75m above the floor. A student tosses an apple vertically upward releasing it 0.5m above the floor. find the maximum initial speed that can be given to the apple
The potential difference between the ends of a resistor is 9 V and the rate of energy dissipation in it is 18 W. What is the value of that resistor
A bowling ball weighs 70.8 N .The bowler applies a horizontal force of 169 N to the ball. find the magnitude of the horizontal acceleration of the ball?
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