Describes how a simple machine can make work easier?

Answers

Answer 1

Answer: simple machines such as ramps lessen the moment required to do work. if a triangle has a base of 5 and the height is 7, a ramp would make the hypotenuse of this triangle lessoning the total distance. using a²+b²=c² 25+49=c² 74≈8.6 and it is obvious that 8.6 is less than 12 in every unit. other simple machines such as pulleys make it lighter making it simply easier for an object to be lifted.

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Ceres is BEST classified as a(n) ___.a. asteroid
b. meteoroid
c. dwarf planet
d. Kuiper Belt object

Answers

Ceres is best classified as a dwarf planet. Ceres is located in he asteroid belt. Ceres is much closer to Earth than Pluto and it was discovered in the year of 1801.

Option C.

Ceres is considered the smallest dwarf planet of the solar system.

An object traveling at a constant speed but with a changing direction is accelerating. a. True
b. False

Answers

Strange as it may seem, that's true. (choice 'a'.)

"Acceleration" doesn't mean "speeding up". It means ANY change in
the speed or direction of motion. So a car with the brakes applied
and slowing down, and a point on the rim of a bicycle wheel that's
turning at a constant rate, are both accelerating.

True, it is still moving.

If it takes 50n of force to lift a 450n what is the ma of the machine

Answers

If the machine is 100% efficient, then its
Mechanical Advantage is (450/50) = 9 .

If the machine is less than 100% efficient,
then the MA is more than 9 .

Suppose that you are riding a bike away from your dog who sits and watches you leave. If you use the bicycle as a reference frame, how does your dog appear to move?

Answers

If you use the bicycle as a reference frame, your dog will appear to be moving backwards farther from you/your bicycle. Although the dog is sitting on one place, your bicycle is moving away from the dog.

You shoot a model rocket into the air with a speed of 18.2 m/s. now high does the rocket go?

Answers

We don't know anything about the engine on the model rocket ...
how long it burns after launch, how much force it exerts, how much
impulse or acceleration it imparts to the rocket, etc.
The only thing we can do with this question is to think of the craft as
a rock instead of a rocket ... assume that after launch, there are no
forces on it except the force of gravity.

Acceleration of gravity = 9.8 m/s²
This is the amount of speed lost each second.
So the rocket continues to climb for (18.2)/(9.8) = 1.857 seconds

At the bottom, its speed is 18.2 .
At the top, its speed is zero.
Its average speed during the climb is (1/2) (18.2 + 0) = 9.2 m/s .

It climbs at an average speed of 9.2 m/s for 1.857 seconds.

It reaches the altitude of (9.2) x (1.857) = 17.09 meters above the launch pad.

from 3rd equation of motion we get
v² = u² + 2gh
as final velocity is 0 m/s ; accleration due to gravity = 9.8 m/s²
(0)²=(18.2)²+2(-9.8)(h)
0=331.24 - 19.6(h)
(-331.24) ÷ (-19.6) = h
therefore h = 16.9 meters

The direction of swing of a Foucault pendulum appears to change due to Earth’s

Answers

French Physicist Leon Foucault introduced his pendulum in 1851.
By that time, it was generally accepted that the Earth rotates, but
Foucault's pendulum was the first simple demonstration that made
the Earth's rotation easy to prove.

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