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A 42 kg surfer jumps off the back of a 22 kg surferboard that is moving forward with a velocity of 5.2 m/s. After the surfer leaves the surfboard, it moves forward with a velocity of 6.1 m/s. With what velocity did the surfer leave?
A hollow metal sphere has 7cm and 10cm inner and outer radii, respectively. The surface charge density on the inside surface is -150nC/m2. What is the strength of the electric field at points 4cm, 8cm and 12cm from the center
A pendulum oscillating on the moon has the same period as a(n) 3.14 m pendulum oscillating on Earth. find the length of the pendulum on the moon
A compound microscope has objective and eyepiece focal lengths of 6.1mm and 1.9 cm , respectively. what is the magnification of the instrument
A grandfather clock is controlled by a swinging brass pendulum that is 1.0 m long at a temperature of 22°C. What is the length of the pendulum rod when the temperature drops to 0.0°C?
What is the rms speed of nitrogen molecules contained in an 7.9 m3 volume at 2.1 atm if total amount of nitrogen is 1100 mol.
A uniform meter stick is freely pivoted about the 0.20-m mark. If it is allowed to swing in a vertical plane with a small amplitude and friction, what is the frequency of its oscillations
At the bottom of the loop the normal force on the motorcycle is 903 Newtons. What is the radius of the circular loop in meters?
q1. a sled is being held at rest on a slope that makes the angle with the horizontal. after the sled is released it
After flying for 15 min in a wind blowing 42 km/h at an angle of22°south of east, What is the speed of the airplane relative to the air
A stunt pilot with mass of 80 kg performs a vertical circular dive of radius 800 m. What forces are acting on the pilot
A docking shuttle requires to decelerate at a very specific rate, given by a=bt2. If the shuttle is moving at 800m/s and begins at 30km away, how long will it take to dock?
A closed box is filled with dry ice at a temperature of -88.7 oC, while the outside temperature is 24.4 oC. Find the thermal conductivity of the material from which the box is made
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