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Questions in physics

[Open]What are some of the physical properties that describe terriers?

[Open]Magnetic levitation has been used to innovate which aspect of life? Provide examples.

[Open]Does friction help in turning a doorknob?

[Open]How are heat and light waves produced on and in the sun?

[Open]A 50 kg box is pulled by a rope. The rope applies a horizontal force of 180 N to the box. What is the normal force exerted on the box by the floor?

[Open]A skateboarder shoots off a ramp with a velocity of 5.0 m/s, directed at an angle of 57° above the horizontal. The end of the ramp is 1.2 m above the ground. Let the x-axis be parallel to the ground, the +y direction be vertically upward, and take as the origin the point on the ground directly below the top of the ramp. (a) How high above the ground is the highest point that the skateboarder reaches? (b) When the skateboarder reaches the highest point, how far is this point horizontally from the end of the ramp?

[Open]The lightest car in the world was built in London and had a mass of less than 10 kg. Its maximum speed was 25.0 km/h. Suppose the driver of this vehicle applies the brakes while the car is moving at its maximum speed. The car stops after traveling 16.0 m. Calculate the car's acceleration.

[Open]What is the information gathered in a scientific investigation called?

[Open]What is the number of protons in the nucleus of any other isotope of lead?

[Open]A wheel of radius 30 cm is rotating at a rate of 2.0 revolutions every 0.080 s. A. Through what angle, in radians, does the wheel rotate in 1.0 s? B. What is the linear speed of a point on the wheel's rim? C. What is the wheel's frequency of rotation?