An 80- kg quarterback jumps straight up in the air right before throwing a 0.43-kg football horizontally at 15m/s . sort the following quantities as known or unknown. take the horizontal direction to be along the x axis. : the mass of the quarterback, : the mass of the football, : the horizontal velocity of quarterback before throwing the ball, : the horizontal velocity of football before being thrown, : the horizontal velocity of quarterback after throwing the ball, : the horizontal velocity of football after being thrown
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Physics, 21.06.2019 23:20
The 5-kg cylinder is initially at rest when it is placed in contact with the wall b and the rotor at a. if the rotor always maintains a constant clockwise angular velocity v = 6 rad> s, determine the initial angular acceleration of the cylinder. the coefficient of kinetic friction at the contacting surfaces b and c is mk = 0.2.
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3. which is not a primary color of light? blue red green yellow
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Cho is making a bar graph showing the amount of money spent on health care between 1999 and 2005. the dependent variable is the: a: money spent b: year c: number of patients
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Physics, 23.06.2019 08:00
Athin electrical heater is inserted between a long circular rod and a concentric tube with inner and outer radii of 20 and 40 mm. the rod (a) has a thermal conductivity of ka = 0.15 w/(m*k), while the tube (b) has a thermal conductivity of kb = 0.8 w/(m*k) and its outer surface is subjected to convection with a fluid of temperature t= -15°c and heat transfer coefficient 60 w/(m2 *k). the thermal contact resistance between the cylinder surfaces and the heater is negligible. (a) determine the electrical power per unit length of the cylinders (w/m) that is required to maintain the outer surface of cylinder b at 15°c. (b) what is the temperature at the center of cylinder a?
Answers: 2
An 80- kg quarterback jumps straight up in the air right before throwing a 0.43-kg football horizont...
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