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A 25N crate is held at rest on a frictionless incline with a force that is parallel to the incline. If the incline is 25o above the horizontal the magnitude of the applied force is?
A mad doctor believes that baldness can be cured by warming the scalp with sound waves. If 0.23J of sound energy is considered an appropriate "dose," how many minutes should each therapy session last
Light shone from a mystery material into water undergoes total internal reflection at an angle of 33.4 degrees. What is the index of refraction of the mystery material?
For no apparent reason, a poodle is running at a constant speed of 3.40 m/s in a circle with radius 2.8m. Let v1 be velocity vector at time t1, and let v2 be the velocity vector at time t2.
A light wave has a 670 {\rm nm} wavelength in air. Its wavelength in a transparent solid is 420 {\rm nm}. What is the speed oflight in this solid, in m/s? What is the light's frequency in the solid, in Hz?
An 0.8kg baseball with an initial velocity of 40m/s is hit with a baseball bat so that its recoil velocity is 60m/s in the exact opposite direction. what is the average force the bat puts on the ball
A 4.5-g object moving to the right at 30 cm/s makes an elastic head-on collision with a 9-g object that is initially at rest. What fraction of the initial kinetic energy was transferred to the 9-g block
A window repairman picks up one end of a large sheet of glass. What is the larges angle that he can tip the large sheet before the second sheet slips
An RLC circuit consists of a 863 ? resistor, a 49 µF capacitor, and a 265 mH inductor, connected in series with a 78.2 V, 96 Hz power supply. What is the phase angle between the current and the applied voltage? Answer between -180? and +180?
q1. a 1.00-kg teflon disk is slid down a 5.00-m steel plate that is mounted at a 30 degree angle with respect to
A source of sound waves of frequency 0.4 kHz is stationary. What is the observed frequency if the observer moves toward the source
The total electric field consists of the vector sum of two parts. One part has a magnitude of E1 = 1300 N/C, Find the magnitude and direction of the total field
A rectangular trough, 1.9m long, 0.50m wide, and 0.30m deep, is completely full of water. at what speed does water emerge from the hole
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