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What is a vector quantity

A vector quantity is a quantity that has both a magnitude and a direction.

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A pellet of mass 8.8 g embeds itself in a wooden block of 450 g which is suspended by a light in-extensible string. After the collision the block reaches a max height of 0.63 m. Calculate the initial velocity of the pellet.

Max Gravitational Potential energy of combined mass:GPE = m x g x h= ( 0.0088 kg + 0.450 kg ) x 9.81 ms^-2 x 0.63 m = 2.84 J
Therefore Kinetic energy of the combined mass at the collision = 2.84 JKE ...

Answered by Thomas L. • Physics tutor

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What is meant by a uniform electric field?

Region which a force acts on a charged particle and the force is same at all points.

Answered by Dave H. • Physics tutor

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A 4 metre long bar rotates freely around a central pivot. 3 forces act upon it: 7N down, 2m to the left of the pivot; 8N up, 1m to the left of the pivot; 4N up, 1m to the right of the pivot. Apply one additional force to place the bar in equilibrium.

Begin by calculating the current force and moment of the bar.Force: 8+4-7=5 (or vice versa)Moment: 72= 14 Nm anticlockwise 81= 8 Nm clockwise 4*1= 4 Nm anticlockwiseSum calculated moments: 14+4-8...

Answered by Michael A. • Physics tutor

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Calculate the flight time of a ball moving in parabolic motion, with initial velocity 5.0m/s at angle 30 degrees from the horizontal travelling for 23 metres.

First, you would resolve the initial velocity into horizontal and vertical velocity. Then, using the correct suvat equation, s=ut, you can calculate for t. In this case, t=4.0s to 2 significan figures.

Answered by Aabhas S. • Physics tutor

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