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Q. As you ride your 14-kg bicycle on level ground you do some work against a 30N force of air resistance if your mass is 65-kg.What is power you apply to maintain a velocity of 25-km`.a-on level ground b-going up a 5degrees slope?(remember it's a numerical please solve this)
Q. A 41 kg box is being pushed a distance of 7m across the floor by a force P whose magnitude is 151-N. The force P is parallel to the displacement of the box. The coefficient of kinetic friction is 0.25. Determine the work completed on the box by each of the four forces that act on the box. Be sure to include proper plus or minus sign for the work completed by each force.
The 4 block in the figure is attached to a vertical rod by means of two strings. When the system rotates about the axis of the rod, the strings are extended and the tension in the upper string is 77.
Estimate the change in COP of your electric food freezer when it is removed from your kitchen to its new location in your basement, which is 8 C° cooler than your kitchen. (Assume that the temperature in the kitchen is 20°C and that the temperature o..
An astronaut in a satellite says she can just barely resolve two point sources on the Earth, 110km below. Assume λ=540nm, and the pupil diameter of the astronaut's eye to be 5.20mm.
What was the arrow's initial speed. A small sphere with a mass of 2.00×10^-3g and carrying the charge of 4.80×10^-8C hangs from a thread near a very large, charged insulating sheet. The charge density on the sheet is -2.90×10^-9C/m^2 .
A 71 kg skier encounters a dip in the snow's surface that has a circular cross section with a radius of curvature of 12 m. If the skier's speed at point A is 7.0m/s , what is the normal force exerted by the snow on the skier at point B? Ignore fricti..
find the mass of Earth from the period T and the radius r of the Moon's orbit about the Earth. T=27.3 days and r=3.82E5 km. suppose the Moon orbits the center of Earth rather than the center of mass of the Earth-Moon system.
The Hall voltage across a conductor in a 55 magnetic field is 1.9 . When used with the same current in a different magnetic field, the voltage across the conductor is 3.
On a cool morning, when the temperature is 11 ^circC, you measure the pressure in your car tires to be 30.0 psi. After driving 20 mi on the freeway, the temperature of your tires is 53 ^circC.
The length of a string is 322 cm. It is held fixed at each end. The string vibrates in seven sections; such as the string has seven antinodes, and the string vibrates at 160 Hz.
A 1.70 kg block is released from rest and allowed to slide down a frictionless surface and into a spring. The far end of the spring is attached to a wall.
What is total mechanical energy of the motion
Suppose a chimpanzee swings through the jungle on vines. If it swings from a tree on a 13 m long vine that starts at an angle of 45 degrees, what is the chimp's velocity when it reaches the ground.
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