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Q1. A car carrying a 75 kg test dummy crashes into a wall at 31 m/s and is brought to rest in 0.10 s. Find the average force exerted by the seat belt on dummy.
Q2. If a car traveling at 55 km/h will skid 24 m while its brakes lock, how far will it skid if it is traveling at 130 km/h when its brakes lock?
Q3. What is the current in amperes in the wire of radius R = 2.91 mm if the magnitude of the current density is given by (a) Ja =J0r/R and (b) Jb = J0(1 - r/R) in which r is the radial distance and J0 = 5.88 x 104 A/m2?
Two vectors A and B have the similar magnitude of 100 N (they represent forces of equal strength). What is the magnitude of the resultant vector of A and B if they are parallel and pointing in opposite directions.
The period of a pendulum is proportional to the square root of its length. A 2.5 m long pendulum has a period of 3.0s
A projectile is shot from the edge of a cliff 140 m above ground level with an initial speed of 100 m/s at an angle of 37 degrees with the horizontal. Find out the time taken by the projectile to hit point at ground level.
What is the direction of the electric field at point P and determine the linear charge density. Put your answer in terms of q, L, a, and physical constants.
During a running long jump, an athlete runs with a speed of 9 m/s horizontally and, upon take off, how far will the athlete jump
A guy is spinning initially at a constant rate with his arms at his sides. He then puts his arms straight out. How much does his moment of inertia change when he sticks his arms out
Suppose it was launched form a launch pad in a space vacuum. Would it work? Illustrate what changes would we observe? Explain
two point charges lie on the x-axis: .30 micro C at x=.15m and .11micro C at x=.70. find the place where the electric field is zero
Suppose the projectile is traveling 85.0 m/s at its maximum height of y = 272 m. Explain how much work has been done on the projectile by air friction?
A spherical balloon is partially blown up and its surface area is measured. More air is then added, by what factor does the radius of the balloon change
A 25 g glass tumbler contains 450 mL of water at 24°C. what is the final temperature of the drink
A camera is equipped with a lens with a focal length of 23 cm. how far from the film should the lens be placed
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