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A spring (k = 812 N/m) ishanging from the ceiling of an elevator, and a 4.8 kg object is attached to the lower end. By how much does the spring stretch (relative to its unstrained length)when the elevator is accelerating upward at a =0.23 m/s2?
a playground merry go round has a radius of 4.40 m and a moment of inertia of 245kg.m^2 and turns with negligible friction about a vertical axle through is center. What is the average power supplied by the child
An electron is released from rest at the negative plate of a parallel plate capacitor. The charge per unit area on each plate is = 2.6 x 10-7 C/m2, the plates are separated by a distance of 1.4 x 10-2 m. How fast is the electron moving just before..
In a head-on collision, a car stops in 0.19s from a speed of 26m/s The driver has a mass of 63kg and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt during that fraction of a second
A car is towing a boat on a trailer. The driver starts from rest and accelerates to a velocity of +13.2 m/s in a time of 27.9s. What is the tension in the hitch that connects the trailer to the car
A transparent oil with index of refraction 1.28 spills on the surface of water (index of refraction 1.33), producing a maximum of reflection with normally incident green light (wavelength 500 nm in air). Assuming the maximum occurs in the first order..
A particle of mass m1 = 3.74kg is traveling in the positive x-direction with a velocity of 17.5m/s. What is the angle that the new trajectory makes with the x-axis
A hawk flies in a horizontal arc of radius 14.4 m at a constant speed 3.55 m/s. (a) Find its centripetal acceleration. (b) It continues to fly along the same horizontal arc, but increases its speed at the rate of 1.35 m/s2. Find the acceleration in t..
A planet moves in an elliptical orbit around the sun. The mass of the sun is Ms. The minimum and maximum distances of the planet from the sun are R1 and R2, in that order.
An electron and a positron have masses of 9.11 10-31 kg. They collide and both vanish, with only electromagnetic radiation appearing after the collision. determine the energy of the electromagnetic radiation
A long slender bar is made from an unknown material. The length of the bar is 0.752 m, its cross-sectional area is 1.48 × 10-4 m2, Find the Young's modulus of the unknown material
The brightest star in the night sky is Sirius, which is at a distance of 8.3x1016 m. When we look at this star, how far back in time are we seeing it? Enter answer in years. Do not enter units.
Oxygen, modeled as an ideal gas, is in a container and has a temperature of 63.9°C. What is the rms-average magnitude of the momentum
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