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A 33-kg girl is bouncing on a trampoline. During a certaininterval after leaving the surface of the trampoline, her kineticenergy decreases to 190 J from 450 J. How high does she rise duringthis i nterval? Neglect air resistance.
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An artillery shell is fired at an angle of 48.1? above the horizontal ground with an initial speed of 1920 m/s. The acceleration of gravity is 9.8 m/s2. Find the total time of flight of the shell, neglecting air resistan ...
Question: The surface charge density on an infinite charged plane is - 1.70 x 10^-6 C/m^2 . A proton is shot straight away from the plane at 2.20 x 10^6m/s. How far does the proton travel before reaching it's turning poi ...
Question: A rifle with a barrel length of 59cm fires a 8g bullet with a horizontal speed of 430m/s . The bullet strikes a block of wood and penetrates to a depth of 15cm. A) What resistive force (assumed to be constant) ...
Describe the effect on speed, frequency, and wavelength of a sound traveling from warm to cold air. (hint:cold air is more dense than warm air).
Question: A thin stream of water flows vertically downward. The stream bends toward a positively charged object when it is placed near it. The positively charged object is then removed. What will happen to the same strea ...
Question: Oxygen gas (O2) has a molar mass of about 32.0 g/mol, and hydrogen gas (H2) has a molar mass of about 2.00g/mol. Calculate (a) the rms speed of an oxygen molecule when the temperature is 300 K, and (b) the rms ...
Question: A pendulum is made by tying a 520g ball to a 46.0cm -long string. The pendulum is pulled 21.0?to one side, then released. A) What is the ball's speed at the lowest point of its trajectory? B) To what angle does ...
Question: A solid sphere and a solid disk of the same mass and radius are rolling wihtout slipping at the same speed. A. What is the ration of their kinetic energies? B. What is the ratio of their angular momenta (measur ...
Question: A parallel-plate air capacitor has a capacitance of 920 pF. The charge on each plate is 3.90 ÎC. What is the potential difference between the plates? Express your answer with the appropriate units. Part B If th ...
At a playground, a toddler climbs on his bike starts to pedal away from his dad as fast as he can, at 12.6 km/h, towards a busy road that is 74.2 m away. At Δt=3.44 seconds later, his dad glances up from his phone and no ...
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