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You are dragging a heavy box with a mass of 90.0 kg across the floor at a constant velocity with a horizontal force of 300.0 N. a) Calculate uk. b) A friend tries to assist you by pushing up on the box with a force of 100.0 N . How much less force will you need to exert to keep the box moving at a constant velocity?
A student has a mass of 49.2 kg and is sitting on a seat of a rollercoaster. The ride makes the seat move up and down. Determine the normal force acting on the student if they are: a) moving at a constant velocity of 10.0 m/s up3 marks) b) accelerating 2.1 m/s ^ 2 (down)
Given the action force, describe the reaction force. a) You push a shopping cart with a force of 20.0 N [ W b) A golf club hits a golf ball with 952.7 N [forward). c) A high jumper exerts a force of 1.02 kN ( down) into the ground.
A 5.0 kg cart on a table is connected to a string that hangs over pulley suspending a 3.0 kg block over the side of the table. Assuming no friction acts on the system , determine the acceleration of the cart and the tension in the string.
During a sky dive, a 61.0 kg skydiver experiences wind resistance acting with a force of 410 N [up] Calculate the net force on the skydiver
A metal block with a mass of 5.2 kg is pushed east along a flat surface with a force of 4.0 N. IF the force of friction is 2.0 N , draw a FDB of the situation, and calculate the net force on the metal block.
The athlete rotates a 1.00-kg discuss along a circular path of radius 1.06 m. The maximum speed of the discus is 20.0 m/s. Determine the magnitude of the maximum radial acceleration of the discus.
A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls calculate the phase velocity for dominant mode.
Most antenna consisting of a 50 meter long vertical conductor operates over a perfectly conducting ground plane. It is base fed at a frequency of 600 kHz. The radiation resistance of the antenna in ohms is
Calculate the directivity of an antenna for θE = 30°, θH = 60
