Mechanics | Relativity Answers

What is displacement current

Six measurements were made of the time in seconds for 20 oscillations of a mass hung from a spiral spring as follows: 20.1, 20.2, 20.3, 20.1, 20.0, 20.2. The mean value of the period of oscillation is

A dart with mass md is launched toward a block of mass mb that is suspended from a string of length L, as shown at left above. The dart is moving horizontally with speed b immediately before it strikes the block and remains embedded. The dart-block system then swings up to a point at which it’s center of mass reaches a maximum height H above it’s starting position, as shown at the right above. The blocks mass md is greater than the darts mass md. A) Indicate which object, the dart or the block, if either, experience an impulse of larger magnitude during the collision. If the impulse is the same magnitude for both objects, state this explicitly, Briefly explain your reasoning. B) If the speed of the dart as it embeds itself into the block is greater than v, how would the maximum height reached by the center of mass of the dart-block system compare to H? Explain your response without deriving or manipulating equations.

We look at a small block with a mass of 5.0 kg that is at rest in point A before it slips. The block slides along the slope plane to point B. After passing point B, it freely moves to the ground at point C. The acceleration of gravity is 9.81 m / s2. We can claim the block as a point particle in this task and we disregard air resistance.

a) Vi antar først at det ikke er friksjon mellom klossen og skr˚aplanet. Bestem klossens fart i punkt B.

Two objects are involved in a perfectly elastic head-on collision on a frictionless air hockey table. The objects have masses of 6.21kg and 9.4kg respectively. If the first object has a final velocity of 1.9m/s [right]and the second object has a final velocity of 0.80 m/s [left], calculate the initial velocities of each object

A pendulum is raised 0.7m above the floor, is released and then swings freely. Neglecting all frictional forces, what is the velocity of the pendulum when it is 0.25 m above the floor?

Two strings each inclined at an angle of 30 to the horizontal are used to lift a bucket of water weighing 20N. Calculate the tension in each string.

An airplane whose air speed is 650km/h is supposed to fly in straight path 35° north of east. But a steady 95 km/h wind is blowing from north. In what direction should the plane head and what is the plane resultant speed? [6]

A volley ball is thrown straight upward on the moon with an initial speed of 30 m/s .Calculate:
(a) The maximum height reached by the ball.
(b) The time taken to reach that height.
(c) Its velocity 20s after it is thrown.
(d) When the ball’s height is 50m.
(g = 1.60m/s2 on the moon).

In the figure below, two particles with a mass m1= 0.83kg are fastened to each other and to a rotation axis at O by two thin rods each with length d=10 cm and mass=1.4 kg. The combination rotated around the rotation axis with angular speed w= 0.33 rad/s. Measures by O, what is the combination’s rotational inertia?