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1. A 75 kg bobsled is pushed along a horizontal surface by two athletes. After 4.5 m from rest, the bobsled has a speed of 6.0 m/s. How much force did the two athletes push with?
2. In 1990, Roger Hickey, 74 kg, of California reached a speed of 35 m/s (77 mph) on his skateboard, 3.6 kg. How much force would be needed to stop him in a distance of 150 m (about half a football field)?
3. A car that weighs 14700 N is traveling at 25 m/s. The brakes are applied and the car stops. The braking force is -7100 N. What was the braking distance?
An electron moves at a speed of 480m/s perpendicular to the direction of the uniform magnetic field of 1 T. What is the radius of the electron's circular orbit in units of nanometers (1 m = 109 nm)
Imagine that we connect a formula36.mml lightbulb and an formula37.mml lightbulb in parallel and connect the set to a 19-V battery
A 27.0 g copper ring at 0°C has an inner diameter of D = 3.04591 cm. A hollow aluminum sphere at 87.0°C has a diameter of d = 3.05180 cm. What is the mass of the sphere
A steel ball of mass .5 kg is fired vertically up from the edge of a building 20 m high with an initial speed of 10 m/s. find the average resistance force that sand exerts on the ball
Imagine two 1.5 bags of protons, one at the earth's north pole and the other at the south pole. A. Calculate the gravitational attraction that each bag exerts on the other.
The central star of a planetary nebula emits ultraviolet light with wavelength 104nm, What is the first-order diffraction angle
A) Assuming that the Styrofoam absorbs a negligibly small amount of heat and that no heat was lost to the surroundings, what is the specific heat of the metal? B) Which is more useful for storing heat, this metal or an equal weight of water? defin..
A converging lens of focal length 19.2 cm is separated by 55.3 cm from a converging lens of focal length 4.72 cm. If the height of the object is 3.10 cm, what is the height of the final image
A technician wraps wire around a tube of length 37 cm having a diameter of 8.2 cm. what is the self-induced emf in the solenoid
An archer pulls back 0.75 m on a bow which has a stiffness of 200 N/m. The arrow weighs 50 g. What is the velocity of the arrow immediately after release
A silver wire has resistivity p = 1.96 x 10-8 ohm·m and a cross-sectional area of 4.40 mm2. What is the displacement current in the wire at that time
A Boeing 747 "Jumbo Jet" has a length of 59.7 m. The runway on which the plane lands intersects another runway, How much time is needed for the plane to clear the intersection
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