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A light platform is suspended from the ceiling by a spring. A student with a mass of 74 kg climbs onto the platform. When it stops bouncing and reaches its new equilibrium position (x=0), the student notices that the spring has stretched 0.79 m. The student's friend pulls the platform down 0.29 m further and then releases it at t=0. What is the amplitude of the motion of the student on the platform? What is the maximum speed? At what time does the maximum speed occur?
A charge of 2.05mC is placed at each corner of a square 0.160m on a side. Determine the magnitude of the force on each charge
A hunter aims directly at a target (on the same level) 140 m away.
An x-ray beam (25 MeV) strikes a proton at rest and scatters the x-rays through an angle of 100 degrees. What is the wavelength of the scattered x-rays
A bucket of mass 1.50 is whirled in a vertical circle of radius 1.20. At the lowest point of its motion the tension in the rope supporting the bucket is 25.00 N. Find out the speed of the bucket. How fast must the bucket move at the top of the circle..
a harvest mouse can detect sounds as quiet as -10 dB. suppose you are sitting in a field on a very quiet day while a harvest mouse sits nearby at the entrence to its nest, How far is the harvest mouse from the leaf
A person driving her car at 49 km/h approaches an intersection just as the traffic light turns yellow. She knows that the yellow light lasts only 2.0 s before turning to red, and she is 30 m away from the near side of the intersection .
An ultralight plane and pilot have a total mass of 156 kg. what is the net force acting on the plane and pilot
A torque of 60 Nm producing a counterclockwise rotation is applied to the wheel about its axle. A frictional torque of 10 nm acts at the axle.If the wheel is observed to accelerate at the rate of 2rad/s2 under the influence of these torques, what i..
Explain how many atoms strike the umbrella each second? Assume that the wind blows horizontally so that the gravity can be neglected.
A 60 g bullet traveling at 230 m/s penetrates a block of ice at 0°C and comes to rest within the ice. suppose that the temperature of the bullet doesn't change appreciably, how much ice is melted as a result of the collision.
A vacuum cleaner belt is looped over a shaft of radius 0.44cm and a wheel of radius 1.50cm. What is the speed of a point on the belt
A laser beam is incident on two slits with a separation of 0.210 mm, and a screen is placed 5.30 m from the slits. what is the wavelength of the laser light
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