Which statement best explains the difference between greenhouse gases and other atmospheric gases?(1 point)
1 answer:
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The force needed to the stop the car is -3.79 N.
Explanation:
The force required to stop the car should have equal magnitude as the force required to move the car but in opposite direction. This is in accordance with the Newton's third law of motion. Since, in the present problem, we know the kinetic energy and velocity of the moving car, we can determine the mass of the car from these two parameters.
So, here v = 30 m/s and k.E. = 3.6 × 10⁵ J, then mass will be
Now, we know that the work done by the brake to stop the car will be equal to the product of force to stop the car with the distance travelled by the car on applying the brake.Here it is said that the car travels 95 m after the brake has been applied. So with the help of work energy theorem,
Work done = Final kinetic energy - Initial kinetic energy
Work done = Force × Displacement
So, Force × Displacement = Final kinetic energy - Initial Kinetic energy.
Thus, the force needed to the stop the car is -3.79 N.
Answer:
6.62s
Explanation:
Metric unit conversion:
364 g = 0.364 kg
789 g = 0.789 kg
Starting from rest, the cart takes 4.49 s to travel a distance of 1.43 m. We can use the following equation of motion to calculate the constant acceleration
Using Newton's 2nd law, we can calculate the force generated by the fan to push the 0.364 kg cart forward
Now that more mass is added, the new acceleration of the 0.789 kg cart is
We can reuse the same equation of motion to calculate the time it takes to travel 1.43 m from rest