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Physics
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What is the difference between a scalar and a vector?

In physics, a scalar is a quantity of a one value to describe the size of a physical property, such as energy or dis...

Answered by Christopher B. Physics tutor
1479 Views

I throw a ball straight up with an initial velocity of 2m/s. How high is it after a fifth of a second?

assign each variable to a value in s = ut + 1/2at2u = 2m/s t=0.2sa=-9.81m/s2so s = (2 x 0.2) + 1/2(-9.81)(0.2)2so s =

Answered by Henry A. Physics tutor
1714 Views

State assumptions made about the motion of the molecules in a gas in the derivation of the kinetic theory of gases equation.

The molecules move in random motion. Collisions of molecules with each other and with the walls are elastic (total kinetic energy stays constant). Time in contact is small compared with time between colli...

Answered by Marina J. Physics tutor
4971 Views

If a car sets off from rest with a constant acceleration of 3 m/(s^2), what would its speed be after 5 seconds?

Firstly we write down all known variables: Initial speed (u)=0 m/s, Acceleration (a)=3 m/s2, Time (t)=5s. Final velocity (v)=?Therefore, the equation chosen to solve the problem would be: v=u+a...

Answered by Shahnaan M. Physics tutor
1492 Views

Why do atoms larger than iron release energy when they undergo fission?

For this problem we need to consider the strong nuclear force (SNF), and the electromagnetic force (EMF). Recall that the SNF attracts very strongly over very small distances (≈10-15m), and the...

Answered by Henry B. Physics tutor
1828 Views

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