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A 255 kg piano slides 4.2 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40 Figure 6-36(a) Calculate the force exerted by the man. N (b) Calculate the work done by the man on the piano. J (c) Calculate the work done by the friction force. J (d) What is the work done by the force of gravity? J (e) What is the net work done on the piano? j
The work done by an external force to move a 6.50 uC charge from point a to point b is 0.0240 J. The charge started from rest, Find the potential difference, Vba between points
A box of mass 15 kg slides at a constant velocity, along a flat surface, with a coefficient of kinectic friction of 0.75. how much work is done is done by the normal force
In a historical movie, two knights on horseback start from rest 73 m apart and ride directly toward each other to do battle. Sir George's acceleration has a magnitude of 0.15 m/s2, while Sir Alfred's has a magnitude of 0.28 m/s2. Relative to Sir Geor..
A 71 kg skier encounters a dip in the snow's surface that has a circular cross section with a radius of curvature of 12 m. If the skier's speed at point A is 7.0m/s , what is the normal force exerted by the snow on the skier at point B? Ignore fricti..
The bunchberry flower has the fastest-moving parts ever seen in a plant.at first , the stamen are held by the petals in a bent position, storing elastic energy like a coiled spring.
A capacitance C and an inductance L are operated at the same angular frequency. A) At what angular frequency will they have the same reactance? Express your answer in terms of the variables C and L. B) If L = 5.30mH and C = 3.40\mu F , what is the nu..
A uniform thin rod of length 0.50 m and mass 4.0 kg can rotate in a horizontal plane about a vertical axis through its centre. what is the bullet's speed just before impact
Guns on World War II battleships could shell targets 15 km away. Find (a) the minimum launch speed needed to achieve that range and (b) the shell s flight time under these conditions
A ball attached to a string is twirled in a circle of radius 1.25 m. If the constant speed of the ball is 2.25 m/s, what is the period of the circular motion
If the uncertainty in the energy of an excited state is a billionth of an electron volt (1 neV), what is the half-life of the state
An oscillating mass-spring system has A total energy of 1.18J , amplitude of 9.84cm, Find the spring constant , the mass of the block and the angular frequency
Take element Z = 70 from the periodic table. Ionize it 69 times so that there is only one electron left orbiting around the nucleus. What is the ground state energy of the electron?
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