Top answers

A ball is thrown up with an initial velocity of 8 m/s and initial height of 1.5m above the ground. Calculate the maximum height the ball reaches and the time it takes to get there.

Travelling upwards u = 8m/s v = 0 m/s a = -9.8m/s S = ? t = ? v = u + at v 2 = u 2 + 2a(S - 1.5) 0 = 8 -9.8t 0 = 64 + 2*(-9.8)*(S - 1.5) 9.8t = 8 19.6*(S - 1.5) = 64 t = 0.816s (3.sf) S - 1.5 = 3.265m S = 4....
ES
Answered by Evan S. • Physics tutor
7561 Views

A person weighs 620N on Earth. The gravitational constant on Mars is 3.8m/s^2. How much does this person weigh on Mars?

If the person weighs 620N on Earth, their mass is 620/9.8=63.3kg on Earth. Therefore applying F=ma they must weigh 63.3*3.8=240N on Mars.
TM
Answered by Tomas M. • Physics tutor
9908 Views

Discuss the difference between sharpness and contrast in x-ray imaging

Sharpness describes how well the edges of structures in an x-ray image are defined, while contrast describes the difference in degree of blackening of adjacent structures.
TM
Answered by Tomas M. • Physics tutor
15762 Views

State Newton's 2nd Law, and use this explain the vertical motion of a parachutist in the descent from her plane to Earth.

Newton's second law: F net = m. a . The net force (vector) on an object is directly proportional to the product of its mass (scalar) and its acceleration (vector). At the instant the parachutist leaves the p...
AB
Answered by Akash B. • Physics tutor
4795 Views

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

A scalar quantity is one that has a magnitude (size) only, and no associated direction in which that size 'points'. A good example of a scalar is temperature, because temperature has a size (for example 20 d...
FN
Answered by Frazer N. • Physics tutor
6584 Views