B. Because chemical changes (for example, burning turning something into ashes) can change it's appearance while physical changes (for example, crumpling a piece of paper) can aswell.
Answer:
the sun
Explanation:
the sun emits all types of electromagnetic radiation but a vast majority of it comes in the for of in the for of visible light ultraviolet rays and infrarays
Answer:
Explanation:
There will be conservation of momentum along horizontal plane because no force acts along horizontal plane.
momentum of first piece = .320 kg x 2 m/s
= 0.64 kg m/s along x -axis.
momentum of second piece = .355 kg x 1.5 m/s
= 0.5325 kg m/s along y- axis .
Let the velocity of third piece be v and it is making angle of θ with x -axis .
Horizontal component of its velocity = .100 kg x v cosθ = .1 v cosθ
vertical component of its velocity = .100 kg x v sinθ = .1 v sinθ
For making total momentum in the plane zero
.1 v cosθ = 0.64 kg m/s
.1 v sinθ = 0.5325 kg m/s
Dividing
Tanθ = .5325 / .64 = .83
θ = 40⁰.
The angle will be actually 180 + 40 = 220 ⁰ from positive x -axis.
746 joules per second = 746 watts = 1 horsepower
340 joules per second = 340 watts = (340/746) = <em>0.456 horsepower</em>
Power is a RATE or a SPEED of doing work.
How long you do it doesn't matter.
Just like 30 miles per hour doesn't change whether you do it for an hour or for 10 minutes.
