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a catapult launches a rock towards a hill 500m away. the rock lands on the hill 20m above the release point of the rock. if the rock was launched at an angle of 30 degrees above the horizontal.
a) find the time the rock is in air.
b) initial total velocity of the ball.
c) the max height of the rock during flight.
Large conventional electromagnets use water cooling to prevent excessive heating of the magnetic coils. ow many liters of water must circulate by the coils each second if the temperature of the coils is not to exceed 50 degree C
A vertical straight wire carrying an upward 21-A current exerts an attractive force per unit length of 8.3×10?4N/m, What is the magnitude of the current in the second wire
A 0.670 m long solenoid is formed by wrapping 420 turns of wire around a hollow cylinder with a radius of 0.130 m. calculate the energy stored in the field
Astronaut Ann wishes to travel from one side of her spaceship to the other side so she pushes herself away from a wall, What is Ann's speed relative to Bob as she drifts across the spacehip
When the afternoon Sun reaches an angle of 30° above the horizon, sunlight ceases to clarify any part of the bottom of the tank. How deep is the tank.
For a particular RLC series circuit, the capacitive reactance is 8.65 ?, What is the maximum voltage across the circuit
A person with mass mp = 72 kg stands on a spinning platform disk with a radius of R = 1.74 m and mass md = 195 kg. find the centripetal acceleration of the person
A banana has 0.45 g of potassium. 0.0117% of that potassium is 4019K, What is the activity of the banana
A hydraulic jack is made with a small piston 1.3 cm in diameter that is used to move a large piston 5.2 cm in diameter. how heavy a load can he lift with the jack
What is the direction from the players original point. he estimates that the car is about 400 m away.
A large balloon of mass 233 kg is filled with helium gas until its volume is 327 m3. Assume the density of air is 1.29 kg/m3, Calculate the buoyant force acting on the balloon
A parallel-plate capacitor has circulat plates of 7.00 cm radius and 1.01 mm separation. Calculate the capacitance in picofarads
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