To solve this problem we use kinematics formulas.
to. What was the acceleration of the rocket during the first 16-s?
Where
= speed after 16 s
= initial velocity = 0
= acceleration during 16 s
Now we use the formula for the position:
Where:
= position after 16 s
= initial position = 0
= 16 s
Then, we know that the altitude of the rocket after 20 s is 5100 meters.
Then we will raise the equation of the position of the rocket from the instant to
where:
Now we clear .
The aceleration is
So:
What is the speed of the rocket when it passes through a cloud at 5100 m above the ground?
The speed is 392.32 m/s
<span>1. The potential energy is 34.3J
2. The kinetic energy is 61,875J.
3. A 0.5 kg ball is at the top of a 20 meter tall hill.
a) What is the ball's kinetic energy ? The ball's kinetic energy is zero.
b) what is the ball's potential energy ? The ball's potential energy is 98.1J.
c) what is the ball's mechanical energy ? The ball's mechanical energy is 98.1J.
4. 2.0 kg toy has been thrown in the air it is 1.5m above the ground and is moving up at 3.0 m/s
a) What is the toy's kinetic energy ? The toy's kinetic energy is 9J.
b) what is the toy's potential energy ? The toy's potential energy is 29.43J.
c) what is the toy's mechanical energy ? The toy's mechanical energy s 38.43J.</span>
The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without this atmosphere. Radiatively active gases in a planet's atmosphere radiate energy in all directions
Answer:
Newton's second law of motion is F = ma, or force is equal to mass times acceleration.
Answer:
Explanation:
Here we want to find the external resistance of the circuit.
First of all, the terminal voltage of a battery is given by:
where
is the emf
I is the current
r is the internal resistance
According to Ohm's law, when the battery is connected to the external resistance, the voltage on the battery is equal to the voltage drop on the resistor, which is:
where
R is the resistance of the external resistor
Combining the two equations,
Here we have:
is the emf of this battery
is the internal resistance
I = 2 A is the current in the circuit
Solving for R, we find: