Need help with two physics questions

timer Asked: Oct 20th, 2015

Question description

1. Two blocks are free to slide along the frictionless wooden track shown below. The block of mass m1 = 5.03 kg is released from the position shown, at height h = 5.00 m above the flat part of the track. Protruding from its front end is the north pole of a strong magnet, which repels the north pole of an identical magnet embedded in the back end of the block of mass m2 = 9.00 kg, initially at rest. The two blocks never touch. Calculate the maximum height to which m1 rises after the collision.

answer in m

2. A student performs a ballistic pendulum experiment using an apparatus similar to that shown in the first figure. She obtains the following average data: h = 8.70 cm, projectile mass m1 = 67.2 g, and pendulum mass m2 = 263 g.

(a) Determine the initial speed v1A of the projectile.

answer in m/s

(b) The second part of her experiment is to obtain v1A by firing the same projectile horizontally (with the pendulum removed from the path) and measuring its horizontal position x and distance of fall y, as shown in the second figure. What numerical value does she obtain for v1A on the basis of her measured values of x = 272 cm and y = 92.5 cm?

answer in m/s

(c) What factors might account for the difference in this value compared to that obtained in part (a)?

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