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A driver in a car is traveling on a horizontal road at constant speed of 30m/s and observes a traffic light 100 m away changing from green to yellow. The drivers takes 1.30 s in order to react and apply the brakes. The car stops at the traffic light.
a. Draw and label a diagram respresnting the intial physical situation
b. determine the distance from the traffic light that the driver is at the instant that the brakes are applied.
c. determine the constant braking acceleration needed to stop at the traffic light.
d. determine the time interval from when the driver observes the traffic light change from green to yellow until the car stops at the traffic light.
e. carefully draw and label a graph of the velocity(veritical axis) versus the time (horizontal axis) for the time interval when the driver first observes the traffic light until the car stops. Explain the graph descrives the motion.
A wire in the shape of a square has sides of 35 cm and a resistance of 8 ohms. the wire is being pulled out of a uniform magnetic field, B=650mT at a speed of 50cm/s. How much force does it take to pull the wire if the speed remains constant.
A 6.00 V lantern battery is connected to a 10.5 (ohm) lightbulb, What is the internal resistance of the battery
during 9.75 seconds a motorcyclist changes his velocity from v1x -30.3 ms and v1y 13.1 ms to v2x -26.1 ms and v2y
After 2.02 days, the activity of a sample of an unknown type radioactive material has decreased to 82.2% of the initial activity. What is the half-life of this material
An electron is to be accelerated from a velocity of 1.00×106m/s to a velocity of 7.00×106 m/s. Through what potential difference must the electron pass
If 2.05 x 10-4 J of work is required to move 28.7uC of charge from one point to another, what is the electric potential difference between the two points
On planet Bohrod, the acceleration due to gravity is the sameas that on Earth but there is also a strong downward electric fieldwith the feild being uniform close to the planet's surface. What is the equilibrium position of the mass
A circular loop with radius R and mass M carries a current I and is lying on a rough but considerably flat table. Find the minimum magnitude of the magnetic field therefore that one edge of the loop will lift off the table
An emf is induced in a conducting loop of wire 1.14m long as its shape is changed from square to circular, Find the average magnitude of the induced emf if the change in shape occurs in 4.23s
While looking through the Mt. Palomer telescope, you discover a large planetary object orbited by a single moon. calculate the density of Planet Hephaestus
A meterstick of negligible mass has a 0.25 kg mass at its 31 cm mark and a 0.40 kg mass at the 77 cm mark. Where should the fulcrum be so the meterstick is balanced
A flat circular coil with 110 turns, a radius of 3.80 × 10-2 m, and a resistance of 0.340 ? is exposed to an external magnetic field that is directed perpendicular to the plane of the coil, Find the induced current in the coil
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