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A woman walks for 4 min directly north with a average velocity of 6 km/h; then she walks eastward at 4 km/h for 10 min. What is the magnitude of her average velocity? Give your answer in km/hr.
A particle undergoes a displacement Δr of magnitude 57 m in a direction 25° below the x axis. Express Δr in terms of the unit vectors x and y.
Take the initial direction of motion to be the positive direction. (Indicate the direction of the acceleration by the sign of your reply.)
A planet of mass m = 8.15 Ã? 1024 kg is orbiting in a circular path a star of mass M = 6.05 Ã? 1029 kg. What is the orbital period (in earth days) of the planet Tplanet
Explain by how much horizontal force F must a sprinter of mass 62.0 kg exert on the starting blocks to produce this acceleration?
A block of wood with volume V floats in water with 0.62V submerged. In oil the block floats with 0.86V of its volume submerged. Find the density of the wood
Light from an argon laser strikes a diffraction grating that has 5 310 grooves per centimeter. calculate vthe wavelength of the laser light
A golf ball of mass 50 g released from a height 1.5m above a concrete floor bounces back to a height of 1.0 m. What is the amount of energy lost during the impact
A chair of mass 13.0kg is sitting on the horizontal floor; the floor is not frictionless, Use Newton's laws to calculate the normal force that the floor exerts on the chair
Lightning occurs when there is a flow of electric charge (principally electrons) between the ground and a thundercloud. How much charge flows between the ground and the cloud
The force of attraction between a -20.0 ?C and +80.0 ?C charge is 4.00 N, What is the separation between these two charges
A car of mass M= 900-kg travelling at 45.0 kmh enters a banked turn covered with ice. The road is banked at an angle, and there is no friction between road and car's tires.
Two loudspeakers emit 500Hz notes. One speaker sits on the ground. The other speaker is in the back of a pickup truck, What is the truck's speed
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