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A stone thrown from ground level returns to the same level 4 s after. With what speed was the stone thrown? Take g=10ms-2
An archeological specimen containing 10.2gram of carbon has an activity of 0.8 Bq. Estimate How old is the specimen
An astronomical telescope is designed with an overall magnification of 80x. The objective has a focal length of 98.0 cm. How far should the eyepiece be from the objective
a thin uniform bar of mass m and length 32l is suspended by a string of length l and negligible mass. find the normal
A 22 g dried sample of food is placed in an aluminum bomb calorimeter and burned completely. The device consists of an aluminum chamber (0.50 kg) containing the sample, how many kilocalories did the food make available
Two very small plastic balls of equal mass are released from rest. One of them carries +10 µC of excess charge and the other one carries +1µC of charge. No other charges or fields are present. Which of the following statements are true about them as ..
A banked curve has been designed so that it is safest for a vehicle going 70mph. A 5512 lb vehicle travels with a speed of 60 mph on the curve. Calculate the force that the road exerts on the vehicle
Some forms of cancer can be treated using proton therapy in which proton beams are accelerated to high energies, then directed tocollide into a tumor, killing the malignant cells. Suppose a protonaccelerator is 7.3 m long andmust accelerate proton..
A student throws a set of keys vertically upward to her sorority sister, who is in a window 4.00m above. The second student catches the keys 1.50s later. (a) With what initial velocity were the keys thrown? (b) what was the velocity of the keys just..
Runner A is initially 6.80 km west of a flagpole and is running with a constant velocity of 2.6 km/h due east. Runner B is at first 3.80 km east of the flagpole and is running with a constant velocity of 8.20 km/h due west. What will be the distan..
When a potential di?erence of 150V is applied to the plates of a parallel-plate capacitor, the plates carry a surface charge density of 30.0nC/cm2, What is the spacing between the plates
A certain semiconductor device requires a tunneling probability of T=10^-5 for an electron tunneling through a rectangular barrier with a barrier height of Vo=0.4eV. Determine the maximum barrier width
A movig particle encounters an external electric field that decreases its kinetic energy from 9130 eV to 7570 eV as the particle moves from position A to position B, Determine the charge of the particle
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