Answer:
Approximately
.
Assumption: air resistance on the rocket is negligible. Take
.
Explanation:
By Newton's Second Law of Motion, the acceleration of the rocket is proportional to the net force on it.
.
Note that in this case, the uppercase letter
in the units stands for "mega-", which is the same as
times the unit that follows. For example,
, while
.
Convert the mass of the rocket and the thrust of its engines to SI standard units:
- The standard unit for mass is kilograms:
. - The standard for forces (including thrust) is Newtons:
.
At launch, the velocity of the rocket would be pretty low. Hence, compared to thrust and weight, the air resistance on the rocket would be pretty negligible. The two main forces that contribute to the net force of the rocket would be:
- Thrust (which is supposed to go upwards), and
- Weight (downwards due to gravity.)
The thrust on the rocket is already known to be
. Since the rocket is quite close to the ground, the gravitational acceleration on it should be approximately
. Hence, the weight on the rocket would be approximately
.
The magnitude of the net force on the rocket would be
.
Apply the formula
to find the net force on the rocket. To make sure that the output (acceleration) is in SI units (meters-per-second,) make sure that the inputs (net force and mass) are also in SI units (Newtons for net force and kilograms for mass.)
.
<h2>Hello!</h2>
The answer is: A. 19.3 joules
<h2>
Why?</h2>
Since it's an elastic collision, the kinetic energy after and before the collision will be the same.
Kinetic energy can be calculated using the following equation:

Where:

So,
First object, (going to the right):


Second object:, (going to the left):


Remember,

Hence,
The total kinetic energy after the collision will be:

The total kinetic energy after the collision is 19.3 joules (rounded to the nearest tenth)
Have a nice day!
Answer:
Galileo thought that a ball, rolling or sliding down a hill without friction, would run up to the same height on an opposite hill.
Suppose that the opposite hill was horizontal. Would the ball's motion continue forever along the tangent, or forever parallel to the Earth's surface
Galileo's conclusion from this thought experiment was that no force is needed to keep an object moving with constant velocity.
Newton took this as his first law of motion.
Explanation:
Here ya go-
Answer:
<em>Elevator That Is Moving Downwards At A Constant Speed Of 4.9 M/S. What Is The Magnitude Of The Net Force Acing On The Student?</em>
<em>This problem has been solved!</em>
<em>This problem has been solved!See the answer</em>
<em>This problem has been solved!See the answerA student weighs 1200N. They are standing in an elevator that is moving downwards at a constant speed of </em><em>4.9 m/s. What is the magnitude of the net force acing on the student?</em>