Answer:
F = 98.67 N
Explanation:
Given that,
The initial velocity of the sled, u = 1.6 m/s
The mass of the child and the sled is 37 kg
The sled stops pushing on it for 0.60s in a direction opposite to its motion.
We need to find the magnitude of the average force you need to apply to stop the sled.
Impulse = change in momentum
We have, v = 0
So, the magnitude of the average force is 98.67 N.
Answer:
Time period,
Explanation:
Given that,
The quartz crystal used in an electric watch vibrates with a frequency of 32,768 Hz, f = 32768 Hz
We need to find the period of the crystal's motion. The relationship between the frequency and the time period is given by :
T is the time period of the crystal's motion.
Time period is given by :
So, the time period of the crystal's motion is . Hence, this is the required solution.
Answer:
The velocity of the truck after this elastic collision is 15.7 m/s
Explanation:
It is given that,
Mass of the car,
Mass of the truck,
Initial velocity of the car,
Initial velocity of the truck, u₂ = 0
After the collision the velocity of the car is, v₁ = -11 m/s
Let v₂ is the velocity of the truck after this elastic collision. Using the conservation of momentum as :
So, the velocity of the truck after this elastic collision is 15.7 m/s. Hence, the correct option is (c).