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A 50 kg ice-skater is moving toward the east across a frictionless frozen lake with a constant velocity when the constant force from a sudden wind pushes on the skater toward the west. A plot of positionx versus timet for the skater's motion is shown in the figure, wheret = 0 is taken to be the instant the wind starts to blow and the positive direction of thex axis is toward the east.(a)What is the kinetic energy of the ice-skater att = 0?(b) How much work does the force of the wind do on the ice-skater betweent = 0 andt = 3.0 s?
The area of a typical eardrum is about 5.0 × 10?5 m2. (a) Calculate the sound power (the energy per second) incident on an eardrum at the threshold of hearing. W (b) Calculate the sound power incident on an eardrum at the threshold of pain. W
A hovercraft of mass 69.0 kg can move on a horizontal surface, the x-y plane. A single unbalanced force acts on the hovercraft, How much work is done on the hovercraft by the force during this time
A proton travels with a speed of 3.00 ? 106 m/s at an angle of 55.0° with the direction of a magnetic field of 0.520 T in the +y direction. determine the magnitude of the magnetic force on the proton
A copy-cat daredevil tries to reenact Evel Knievel's 1974 attempt to jump the Snake River Canyon in a rocket-powered motorcycle. What is the minimum launch speed required for the daredevil
here is a point on the x-axis between the two charges where the electric field is zero. Find out the location of the point where the electric field is zero.
A thin uniform rod (length = 1.09 m, mass = 3.09 kg) is pivoted about a horizontal frictionless pin through one of its ends. What is the angular acceleration of the rod at the instant it is released
A 525-ohm resistor and a 295-mH inductor are connected in series with an ac generator with an rms voltage of 20.0V
A small plastic sphere with a charge of -5.0 nC is near another small plastic sphere with a charge of -15 nC, what is the distance between the spheres
question a hydrogen atom with an electron in its ground state interacts with a photon of light with a wavelength of
Two boxes of mass 6.10 and 5.00 kg are in contact and are accelerated across a horizontal surface by an force of 43.17 N applied parallel to the surface and pushing on the lighter box. What is the magnitude of the force exerted by the heavier box o..
What is the phase angle in a series LRC cicuit with L= 50 mH, R=20ohms, C=100mF? The rms applied voltage is 120 Volts at 60 Hz, How much power is dissipated in the resistor
question1air is blown throughout a circular and horizontal venturi tube. the diameters of narrow and wider sections of
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