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Q. A 75 kg man sits on a massless cart that is on a horizontal surface. The cart is initially stationary and it can move without friction or air resistance. The man throws a 5.0 kg stone in the positive direction, applying a force to it so that it has acceleration +3.5 m/s2 as measured by a nearby observer on the ground. What is the man's acceleration during the throw, as seen by the same observer? Be careful to use right signs.
Q. A stationary radar operator determines that a ship is 11.00 km south of him. An hour later the same ship is 24.0 km southeast. If the ship moved at constant speed and always in the same direction, what was its velocity for the duration of this time? (Hint: Take the origin to be the location of the radar)
An infinitely long line of charge has a linear charge density of 5.50×10-12 C/m. A proton is at distance 17.5 cm from the line and is moving directly toward line with speed 2900 m/s.
On a summer day, the air conditioning breaks down and the air in your classroom becomes very warm and muggy with a vapour pressure of 20 hPa and a temperature of 25o C.
How would you describe why we have different atmospheric pressure on different level (height) of earth's atmosphere in molecular level (molecular behaviour and what causes such behaviour).
Conclude a rough "scale factor" or "plate scale." Measure the distances in mm or cm between each of the marked wavelengths and average the results.
A 79 kg pole-vaulter falls from rest from a height of 4.6 m onto a foam-rubber pad. The pole-vaulter comes to rest 0.30 s after landing on the pad. compute the athlete's velocity just before reaching the pad.
A 60 kg woman stands on a very light, rigid board that rests on the bathroom scale at each end. She is 1.5m away from one side and 0.5 m from the other.
Two identical pellet guns are fired simultaneously from the edge of a cliff. These guns impart an initial speed of 24.1 m/s to each pellet. Gun A is fired straight upward, with the pellet going up and then falling back down, eventually hitting the..
What is the frequency of ultrasound in a medium if he wave length is 3.0 x 10^-3 m and velocity is 1300 mm/ms.
A hot-air balloon is ascending at the rate of 11 m/s and is 68 m above the ground as a package is dropped over the side. How long does it take to reach the ground.
Compute the force of tension or compression
What is the least coefficient of friction between tires and road that will allow cars to negotiate the turn without sliding off the road.
A spring stiffness 900 N/m and relaxed length 1m stands vertically on a table. You hold a block of mass 1 kg barely touching the top of the spring. Assume you let the mass down onto the spring certain distance very slowly and view the mass is not mov..
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