Bananas

Consider a person standing on a scale in an elevator. If the elevator accelerates upwards with an acceleration of 1.27 m/s2 and the person has a mass of 79.2 kg, what would the scale read? HINT: you need to take into account the acceleration due to gravity, as well as that of the elevator.

The figure shows two blocks connected by a cord (of negligible mass) that passes over a frictionless pulley (also of negligible mass). The arrangement is known as Atwood's machine. Block 1 has mass m1 = 1.4 kg; block 2 has mass m2 = 3.7 kg. What are (a) the magnitude of the blocks' acceleration and (b) the tension in the cord? (a) Number i Units (b) Number Units >

Two blocks A and B with mA = 0.9 kg and mB = 0.80 kg are connected by a string of negligible mass. They rest on a frictionless horizontal surface. You pull on block A with a horizontal force of 7.8 N. (A) Find the magnitude of the acceleration (in m/s2) of the blocks. (B) Determine the tension (in N) in the string connecting the two blocks.

The figure below shows two blocks connected to each other by a light cable that passes over a pulley with negligible friction. The block of mass m₁ = 3.10 kg lies on a horizontal table with negligible friction, while the block of mass m₂ = 10.4 kg hangs vertically. m₁ 2₁ = a₂ = (a) What is the magnitude of the acceleration of each block (in m/s²)? (Here, a, is the acceleration of m₂, and an is the acceleration of m₂.) m/s² m/s² Ⓡ (b) What is the tension in the cable (in N)?

The figure shows two blocks connected by a cord (of negligible mass) that passes over a frictionless pulley (also of negligible mass). The arrangement is known as Atwood's machine. Block 1 has mass m1 = 1.1 kg; block 2 has mass m2 = 2.1 kg. What are (a) the magnitude of the blocks' acceleration and (b) the tension in the cord? (a) Number i Units (b) Number i Units >

In a movie, a stuntman places himself on the vertical front of a truck as the truck accelerates. The coefficient of static friction between the stuntman and the truck is 0.370. The stuntman is not standing on anything but can “stick” to the front of the truck as long as the truck continues to accelerate. What minimum forward acceleration will keep the stuntman on the front of the truck?

The drawing shows a 29.2-kg crate that is initially at rest. Note that the view is one looking down on the top of the crate. Two forces, F and are applied to the crate, and it begins to move. The coefficient of kinetic friction between the crate and the floor is k = 0.348. Determine the (a) magnitude and (b) direction (relative to the x axis) of the acceleration of the crate. (a) Number i (b) Number i Units Units Top view 55.0 54.0 N T₂ - N 0'88 ✪ ---+X

The figure shows two blocks connected by a cord (of negligible mass) that passes over a frictionless pulley (also of negligible mass). The arrangement is known as Atwood's machine. Block 1 has mass m1 = 1.2 kg; block 2 has mass m2 = 1.7 kg. What are (a) the magnitude of the blocks’ acceleration and (b) the tension in the cord?

A semi is traveling down the highway at a velocity of v = 39.5 m/s. The driver observes a wreck ahead, locks his brakes, and begins to slide. The truck has mass m and a coefficient of kinetic friction between the tires and the road of μk = 0.25. Write an expression for the sum of the forces in the x-direction for the truck while braking. Using the results from that input an expression for the trucks acceleration, ax, while braking. What is the magnitude of the acceleration in m/s^2, and how far does the truck travel, d in meters, before stopping?