Mechanics | Relativity Answers

A platform diver has a kinetic energy of 12,000 n x m prior to landing in the water bucket. If her mass is 40 kg, what is her final velocity before splash?

A hiker travels 4,5 km in a direction 12 degrees south of west and then 7,2 km in a direction 23 degrees west of south.

Determine the hiker’s overall displacement.

Draw each of the hiker’s individual displacement vectors on the same set of Cartesian axes, so that their initial points coincide at

the origin:

:Determine the components of each of these vectors; then use them to find the resultant/overall displacement:

What is momentum

How large a force parallel to a 300 incline is needed to give a 5.0 kg an acceleration 0.20 m/s2 up the incline a) if friction is negligible? b) if the coefficient is 0.30?

3d^2y/dx^2+dy/dx-14y=0 ; y=(0) ,y'=(0)=-1

A body starts from rest and moves with a uniform acceleration of 2 m/s 2 in a

straight line.

a) What is the velocity after 5 s

b) How far has it travelled in this time?

c) When will it be 100m from its starting point?

A car accelerates from 4 m/s to 20 m/s in 8 s. How far does it travel in this time?

Differentiate between scalar and vector quantities.

Two forces of 5N and 12N act at right angles at the same point on an object. Find

by scale drawing and calculation the resultant force which is equal in magnitude

and direction to the combined effect of the two forces.

Using a scale of 1 cm to represent 10 N find the size and direction of the resultant

of forces of 30 N and 40 N acting at: a) right angles to each other, b) 60 0 to each

other.

Sarah (m=81.2 kg) is traveling at a speed of 18.1 m/s at the top of a 11.5 m high roller coaster loop. Determine Sarah's speed at the bottom of the loop. Include a diagram 

Nolan Ryan reportedly had the fastest pitch in baseball, clocked at 100.9 mi/hr (45.0 m/s) If such a pitch had been directed vertically upwards at this same speed, then to what height would it have traveled (in meters)? 

A bicycle has a kinetic energy of 124 J. What kinetic energy would the bicycle have if it had …

… three times the mass and was moving with one-half the speed?

Answer 1

… twice the mass and was moving at the same speed?

Answer 2

… the same mass and was moving with twice the speed?

Answer 3

… one-half the mass and was moving with twice the speed?

Answer 4

… the same mass and was moving with one-half the speed?

The skin is the largest organ in the human body.For a human adult,the average area of the skin surface is about 1.80m2,how much squared foot is this area