What is the average power of motor during given period
A 653 kg lift starts from rest. It moves upward for 2.8 s with constant acceleration until it reaches a cruising speed of 1.85 m/s. What is the average power of its motor during this period (in kW)?
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A wire with a resistance of 7.1 Ω is drawn out through a die so that its new length is 3 times its original length. Find the resistance of the longer wire, assuming that the resistivity and density of the material are unchanged.
A spherical cavity of radius 4.50 cm is at the center of a metal sphere of radius 18.0cm. Determine the electric field at a point 6.0 cm from the center of the cavity.
A roller coaster car has a mass of 500 kg when fully loaded with passengers. If at point A, the force exerted by the track on the car is 15000 N. What is the acceleration of the car at point A?
During the measurement the phase of the sample changes from solid to liquid, and then from liquid to gas. The mass of the sample is 10g. What is the latent heat of vaporization of Xu in [J/kg]?
The current is 13.4 A, and the energy required to cook one hot dog is 60.7 kJ. If the rate at which energy is supplied is unchanged, how long (in s) will it take to cook three hot dogs simultaneously?
A person doing a chin-up weighs 700 N, exclusive of the arms. During the first 25.0 cm of the lift, each arm exerts an upward force of 355 N on the torso. If the upward movement starts from rest, what is the person's velocity at that point?
A copper wire of cross-sectional area 2.40 × 10-6 m2 and length 3.40 m has a current of 2.00 A uniformly distributed across that area.
An X-ray photon is scattered at an angle of = 180.0° from an electron that is initially at rest. After scattering, the electron has a speed of 5.40 x 106 m/s. Find the wavelength of the incident X-ray photon.
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