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Reaction time is the shortest time interval elapsed after the driver of a car decides to apply the break. (For example, the time wasted immediately after the driver sees a child standing on the road). A driver who is travelling at 25 m/s approaches a traffic light at a distance of 120 m ahead of him when he/she sees the light turn red. The driver's reaction time is 0.3 s. and the best slowing down rate by the brakes for this particular car is 3 m/s2. Will the driver be able to stop in time? (Hint: total distance travelled by the car before a full stop. Draw a simple figure.)
A man is dragging a trunk up the loading ramp of a mover's truck. The ramp has a slope angle of 20.0 ? , Find the vertical component of the force
A 50lb sack of portland cement is dropped from rest onto the scale from a height h = 4ft measured from the scale's plate
Write down your expression in terms of the dipole moment. Express your reply in terms of, and appropriate constants.
NASA sends a satellite to another planet by placing the satellite in a Keplerian orbit (around the sun) such that the perihelion is at the radius of the Earth's orbit (1 AU) and the aphelion is at the radius of the planet's orbit. Most of the trip is..
A 12.0 kg bucket of water of is suspended by a rope wrapped around a windlass, which is the solid cylinder 0.500 m in diameter with mass 14.0 kg. The cylinder is pivoted on a frictionless axle through its center. The bucket is released from rest at t..
If an organ pipe, 2 ft long and with one end closed and one end open, how long is the second organ pipe
An object of unknown mass is attached to an ideal spring with force constant 150N/m and is found to vibrate with a frequency of 6.00Hz. Find the mass of this object
Calculate the momentum of a 17m^3 of air (density of 1.3kg/m^3) hitting a sky diver traveling 52 m/s
The decay constant of Radon is .181/day. A sample of Radon contains 6.00x10^8 Radon atoms. How many atoms are left after 12 days
Two metal balls A and B of negligible radius, connected by a taut nonconducting thread of length 1.30 m, are floating at rest on Space Station Freedom between two metal bulkheads.
An automobile club plans to race a 780 kg car at the local racetrack. The car needs to be able to travel around several 170 m radius curves at 85 km/h. What must the banking angle of the curves be so that the force of the pavement on the tires of the..
A 30-g bullet initially traveling 500 m/s penetrates 12 cm into a wooden block. What average force does it exert on the block
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