Physics Answers

A bug starts at the center of a 12 – in. phonograph record and crawls along a straight redial line to the edge. While this is happening, the record turns through an angle of 450. Draw a sketch of the situation and describe the magnitude and direction of the bug’s final displacement.

If 15.0 g of Ice at -25.0°C is mixed with a mass of antifreeze initially at -3.00°C. If the final temperature of the mixture is -10.0°C, how much antifreeze is present (Cantifreeze=2.24 x 102 J/KgoC)?

a) What is the difference between Instantaneous Velocity and Average Velocity? Give detail with suitable examples.

The EMF of an electric cell with
internal resistance of 2 Ω is 3.5V. If a
current of 0.5A flows when
a resistor is connected across it. Find the
resistance of the resistor.

Check whether V = R^2 is a vector space with respect to the operations (x1,y1) + (x2,y2) = (x1 + x2 - 2, y1 + y2 - 3) and k(x,y) = (kx + 2k -2, ky -3k + 3), k is a real number

The arrow strikes the target with a speed of 45 m / s at an angle of −25 ° with respect to the horizontal. Calculate the horizontal and vertical components of the arrow's final velocity.

A boat travels west at a speed of 24m/s across a river that is flowing south at 9m/s. What is the resultant velocity of the boat?

A 20-kg box lays flat on the surface and has a string attached to its opposite sides (string A and B). String A is attached to another 20-kg box with on an inclined surface at 50 degrees. String B on the other hand is attached to a 5-kg box suspended in the air.

It is less dangerous to jump from a high wall on to loose earth than on to a concrete pavement. Why?

A wooden incline plane is being built, along which wooden crates of merchandise are to be slid down into the basement of a store.

a.what angle with the horizontal should the incline plane be made if the crates are to slide down at constant speed?

b.With what force must a 100 kg crate be pushed in order to start it sliding down the incline plane if the angle of the incline plane is that the one found in (a)?