Subject Answers

Physics

"A 10m long uniform beam is pivoted in its centre. A 30kg point mass is placed on one end of the beam. Where must a 50kg mass be placed in order to balance the beam?"

For a system that is in equilibrium, we know that it has a net moment of zero - in other words:Total clockwise moments = Total anticlockwise momentsIn our given...

"Explain the difference between the direction of the conventional current and the direction of electron flow."

The conventional current is the movement of charges from the positive terminal of the battery to the negative terminal of the battery. On the other hand, electr...

"the moon takes 27.3 days (2.36x10^6s) to orbit the earth . Calculate its distance from the earth . Take the mass of the earth to be 5.975x10^24kg."

To solve this question, we will use the idea of uniform circular motion - i.e. the moon circles around the earth because the gravitational force provides the ce...

Do the SUVAT equations work for acceleration that changes with time?

The simple answer to that is no - SUVAT equations work only when the acceleration is constant.That is because these equations have been derived using the underl...

"A car undergoes uniform acceleration from a starting velocity of 10ms^-1 to 20ms^-1 in 10s. Assuming the car's mass is 2000kg, calculate the net force in the direction of the acceleration."

To find the net force, we will use Newton’s Second Law of Motion:

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Subject Answers

Physics

"A 10m long uniform beam is pivoted in its centre. A 30kg point mass is placed on one end of the beam. Where must a 50kg mass be placed in order to balance the beam?"

"Explain the difference between the direction of the conventional current and the direction of electron flow."

"the moon takes 27.3 days (2.36x10^6s) to orbit the earth . Calculate its distance from the earth . Take the mass of the earth to be 5.975x10^24kg."

Do the SUVAT equations work for acceleration that changes with time?

"A car undergoes uniform acceleration from a starting velocity of 10ms^-1 to 20ms^-1 in 10s. Assuming the car's mass is 2000kg, calculate the net force in the direction of the acceleration."

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