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You are in charge of regulating the temperature of the swimming pool for the next Olympic games. The water in the pool fills a volume of 25 m x 50m x 2m and the water should be kept between 25 and 27 degrees Celsius. Over the past 2 weeks, there has been a heat wave and the temperature of the pool increased to 29 degrees Celsius. Your boss suggests that you put ice in the pool to cool it down. if you want to do this, how much ice ( in kg) will you need?
Calculate the wavelength of light in vacuum that has a frequency of 6.1 105 Hz. Calculate the energy of one photon of such light in vacuum
Two atmospheric sound sources A and B emit isotropically at constant power. find the ratio of the larger power to the smaller power
A 12.8 g bulletis fired horizontally into a 93 g woodenblock initially at rest on a horizontal surface. what was the speed of the bullet immediately before impact
Coherent light from a sodium-vapor lamp is passed through a filter that blocks everything except for light of a single wavelength. find the wavelength of the light that falls on the slits
A bullet of mass 5.5 g is fired horizontally into a 2.1 kg wooden block at rest on a horizontalsurface. The coefficient of kinetic friction between block andsurface is 0.42. The bullet comes to rest in the block, which moves1.50 m.
A mortar* crew is positioned near the top of a steep hill. Enemy forces are charging up the hill and it is necessary for the crew to spring into action. How far down the hill does the shell strike
the three capacitors c3.010-6 f in series are connected across a 30-v battery.a find the charge on each capacitorb find
Your car's fan belt turns a pulley at 3.15rev/s . When you step on the gas for 1.55s , find Through what angle did the pulley turn while accelerating
A torque of 11Nm is applied to a heavy wheel whose moment of inertia is 34 kgm2. What is the angular acceleration of the wheel
When aimed vertically and suddenly released, the spring sends the bearing to a height of 1.39 m. Compute the horizontal distance the ball would travel if the same spring were aimed 28.0 deg from the horizontal.
Compute the linear momentum and angular momentum of a Frisbee of mass 0.130 kg if it has a linear speed of 1.25 m/s and an angular velocity of 62.5 rad/s
a point charge with charge q1 3.60e-6 is held stationary at the origin. a second point charge with charge q2 -4.10e-6
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