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Two persons on ice skates stand face to face and then push each other away. Their masses are 60kg and90kg. find the ratio of their speeds immediately afterwards. which person has the higher speed?
a 2 kg softball is pitched to you at 20 m/s. you hit the ball back along the same path and at the same speed. if the bat was in contact with the ball for .1 seconds, what is the magnitude of the average force the bat exerted
A transparent oil with index of refraction 1.29 spills on the surface of water (index of refraction 1.33), determine the thickness of the oil slick
A production line inspector wants a mirror that produces an upright image within magnification of 7.4 when it is located 15 mm from a machine part.
Two otherwise identical bodies have temperatures of 330K and 3000K , respectively. By what factor does its emission exceed the emission of the other body
Two point charges of equal mass start from rest. What is the distance between the charges and How long will it take the charges to move
A charged rod carrying a negative charge is brought near two conducting spheres that are in contact with each other but insulated from the ground. If the two spheres are then separated, what charge does B have, positive, negative or neutral?
A skier of mass 65.0 kg is racing down a giant slolam course. She starts at the top of the top of the course at rest. Over the course of her run, Calculate the force of kinetic friction over her run
A highway curve with a radius of 400 m is banked properly for a car traveling 80 km/h. how much sideways force must the tires exert against the road if the car does not skid
A convex mirror has a focal length of -11 cm. A lightbulb with a diameter of 6.1 cm is placed 60.0 cm from the mirror. Locate the image of the lightbulb
A solid block is attached to a spring scale. When the block is suspended in air, the scale reads 21.1 N; when it is completely immersed in water, What is the volume of the block
A bird watcher meanders through the woods, walking 0.261 km due east, 0.315 km due south, and 1.74 km in a direction 72.5 ° north of west. find the magnitudes of the bird watchers average velocity
The flux through a hollow uncharged box is 69 Nm2/C. The box is a cube with length 20 cm. How much charge is inside the box
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