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A boy standing on top of a building throws a small ball from a height of H1 = 24.2 m. The ball leaves with a speed of 28.6 m/s, at an angle of 83.0° to the horizontal, and lands on a building with a height H2 = 38.0 m. Neglect air friction, and calculate for how long the ball is in the air?
Lithium, beryllium, and mercury have work functions of 2.30eV,3.90eV, and 4.50eV respectively. Find the maximum kinetic enery for the photoelectrons in each case
A plane is pointed in the positive x direction and is flying with an speed of (200, 0, 0) m/s relative to the air. Find the velocity of the plane with respect to the ground
When you plot 1/Do as a function of 1/Di for a converging lens, the Y-intercept of the best fit line turns out to be 0.055(cm-1). What is the focal length of the converging lens
Two 0.70m -long pendulums hang side by side. The masses of the pendulum bobs are 55g and 65g. To what height does the heavier bob rebound
A toy cannon uses a spring to project a 5.34 g soft rubber ball. The spring is originally compressed by 5.09 cm and has a force constant of 7.98 N/m. With what speed does the projectile leave the barrel of the cannon
question1friend of yours travels by you in his fast sports car at a speed of 0.550 c. it is measured in your frame to
A block of wood is held in place against a rough wall by someone pushing on it with a force directed upward at 28 degrees above the horizontal, What is the mass of the block of wood
At the end of the run, she is 175 m away from the starting point at an angle of 15.0° north of west. Illustrate what were the direction and length of her second displacement? Use graphical techniques.
The voltage across an air-filled parallel-plate capacitor is mesured to be 200 v. find the dielectric constant of the inserted material
A steel wire 2.00m long with circular cross section must stretch no more than 0.260cm, What minimum diameter must this wire have
A flask is filled with 1.58 L (L = liter) of a liquid at 100 °C. When the liquid is cooled to 13.3 °C, What is the coefficient of volume expansion of the liquid
A jet pilot takes his aircraft in a vertical loop, as seen in figure below. If the jet is moving at a speed of 1450 km/hr at the lowest point of the loop, Determine the minimum radius of the circle
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