Answer:
K.E = 463.04 k J
P = 23.14 Watt
Explanation:
given,
mass of automobile = 1200 kg
velocity = 50 km/h
= 50 × 0.278
= 13.9 m/s
kinetic energy = 
=
K.E = 115.93 k J
vehicle accelerated to velocity = 100 km/h
= 100 × 0.2778
= 27.78 m/s
kinetic energy =
=
K.E = 463.04 k J
work done = change in kinetic energy
= 463.04 - 115.93
= 347.11 J
Power = 
Power =
P = 23.14 Watt
Well, first of all, 10³⁰ kg is its mass, not its weight.
-- Density of anything is (its mass) divided by (its volume).
-- You know the white dwarf's mass.
-- The volume of any sphere is (4/3) (pi) (radius)³
-- The radius is 1/2 of the diameter.
-- Now you have the ball. Run with it.
I did it quickly and got (1.91 x 10¹²) kilogram/meter³ .
That may be wrong. You have to check it. And even
if it's correct, you probably want to express density in
units of gram/cm³ the way everybody always does.
The Earth takes (365 and 1/4) days to orbit the sun. That's the length of our 'year'.
Since it's not really possible to make our calendar a quarter of a day longer every year, we make the calendar a <u><em>whole</em></u> day longer every 4 years.
So "Leap years" make up for the extra one-fourth day the Earth takes to orbit the sun.
Answer:
30 kgm/s
Explanation:
The momentum of a body is given by the product of mass and its velocity.
∴ momentum = mv
= 15 × 2
= 30 kgm/s
Newton's 2nd law of motion:
Force = (mass) x (acceleration)
= (0.314 kg) x (164 m/s²)
= 51.5 newtons
(about 11.6 pounds) .
Notice that the ball is only accelerating while it's in contact with the racket.
The instant the ball loses contact with the racket, it stops accelerating, and
sails off in a straight line at whatever speed it had when it left the strings.
