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A boat is traveling upstream at 19 km/h with respect to the water of a river. The water is flowing at 7.0 km/h with respect to the ground. (a) What is the speed of the boat with respect to the ground? (b) A child on the boat walks from front to rear at 4.0 km/h with respect to the boat. What is the child's speed with respect to the ground? Give your answers in km/h.
The fundamental frequency of an open-open tube is 1800Hz when the tube is filled with "zero celicus" helium. What is its frequency when filled with "zero celicus" air? The speed of sound in helium is 970m/s and in air is 331m/s . Express your answer ..
A 3.04 μF capacitor and a 7.84 μF capacitor are connected in series across a 17.0 V battery. What voltage would be required to charge a parallel combination of the same two capacitors to the same total energy?
a 20kg door is spun for 27 s at an anglular speed of 1.2 rev/s by two seperate simultaneous forces. One pushes with force of 53 N, What is the work done by torque spinning the door
An 81.7-g arrow is fired from a bow whose string exerts an average force of 121 N on the arrow over a distance of 78.4 cm
A charge of -2.95 µC is fixed at the center of a compass, What are the magnitude and direction of the net electrostatic force acting on the charge at the center
A horizontal force of 35_N is used help push an 44_kg box up a 13_meter incline. What is the work done by this applied force
You kick a rock off a cliff which is 22.22 m high, with a horizontal velocity of 13.90 m/s, What is the magnitude of the rock's total velocity when it hits the ground below
A resistor with an unknown resistance is connected in parallel to a 12 ohm resistor. while both resistors are connected to an emf source of 12 V, current across the unknow resistor is measured with an ammeter to be 3.0 A. What is the resistance of..
An electromagnetic wave in vacuum has an electric field amplitude of 220 V/m. Calculate the amplitude of the corresponding magnetic field
q1. the wire is made up of atoms with valence 2 and molecular mass 80 gmole where u 1.5605 times 10-27 kg is the mass
a 600-kg car is going around a curve with a radius of 120 m that is banked at an angle of 20deg with a speed of 24.5
An airtight box has a removable lid of area 1.60 10-2 m2 and negligible weight. What is the magnitude of the force required to pull the lid off the box
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