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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.)
An emf of 22.0 mV is induced in a 497 turn coil when the current is changing at a rate of 9.0 A/s. What is the magnetic flux through each turn of the coil
a 3000 kg car passes over a bump in a road that follows an arc of circle of radius 40m. what force does the road exert
It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk makes an angle of 57.3° with the positive x-axis at this time. Find out the angular speed of the wheel at t = 2.30 s.
A 12.9-?F capacitor, a 22.1-k? resistor, a switch, and a 25.0-V battery are connected in series. What is the rate of change of the elecric field between the plates of the capacitor
What is the size of the static friction force on the cabinet when the bed is tilted at 20o? At what angle will the file cabinet begin to slide if the coefficient of static friction of steel on steel is Ms= 0.80 and the coefficient of kinetic frict..
Three successive resonance frequencies for a certain string are 481., 518., and 555. Hz. What is the fundamental frequency
A transformer has 280 turns in the primary and 110 turns in the secondary. by what factor does it change the voltage
The temperatures indoors and outdoors are 297 and 311 K, respectively. How much heat is removed from the house
A 25-g rifle bullet travelling 280-m/s buries itself in a 3.6-kg pendulum hanging on a 2.8m long string, which makes the pendulum swing upward in an arc. Find out the vertical and horizontal components of pendulum's displacement.
Bowling balls can be made from a variety of substances and are required to have a circumference of roughly 27.2 inches. calculate the thickness of the shell
Two small beads having positive charges 18q and q are fixed at the opposite ends of a horizontal insulating rod, extending from the origin (the location of the larger charge) to the point x = d. As, a third small charged bead is free to slide on t..
An aluminum wire having a cross-sectional area equal to 4.90 10-6 m2 carries a current of 8.00 A. Find the drift speed of the electrons in the wire
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