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Q. If a ball is thrown upwards at 20 ft/sec, the height h after t seconds is given by h = -16t^2 + 20t. How many seconds does it take for the ball to reach its greatest height, and what is this height?
Q. An aluminium wire carrying a current of 2 A has a cross-sectional area of 3.0 10-6 m2. Find the drift speed of the electrons in the wire. The density of aluminium is 2.70g/cm3. (Assume three electrons are supplied by each atom.)
Define proton-proton chain efficiently
Choose the correct explanation for why you can determine the maximum load given that theta_min is the minimum angle crane arm can make with the horizontal.
Do you agree with IBM's employment response to competition from software development contractors in India, like Wipro, that are expanding into IT consulting services? Why or why not.
What are magnitude and direction of net electrostatic force
If the coefficient of friction between road and tires on a rainy day is 0.120, what is the minimum distance in which the car will stop.
How close to the edge of the 28.0 kg table, that is 2.2m with legs 1.2m apart, can a 62.0 kg person sit without tipping it over.
A tube of radius 5cm is connected to tube of radius 1 cm as shown above. Water is forced through the tube at a rate of 10 liters/min. The pressure in the 5 cm tube is 1×10^5 Pa. The density of water is 1000kg/m3. Suppose that the water is no visco..
The bullet penetrates into the block and stops due to its friction with the block. The compound system of the block plus the bullet rises to a height of 11 cm along a circular arc with a 20 cm radius A bullet with a m1 = 30.0 g mass is fired horizont..
A 9300 kg boxcar travelling at 23 m/s strikes a second boxcar at rest. The two stick together and move off with a speed of 15 m/s. What is the mass of the second car.
Calculate the threshold wavelength, in nm, of a metal if that metal emits an electron with a kinetic energy of 6.32 × 10-19 J when illuminated with light that has a frequency of 1.97 × 1015 Hz.
Write three methods of increasing the volume of a balloon
A 45.0kg girl is standing on a 170 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.53m/s relative to the plank.
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