Answer:
-4714.28N
Explanation:
Given
- Mass of person, m= 55 kg
- Car speed initially ,u =30
- Car speed finally, v=0(car comes to a halt)
- Duration for the car to come halt,t=0.35 sec
This question is based on the concept of Impulse
Impulse is the force acting in a time interval(usually very short)
it is equal to force multiplied with time and also equal to change in momentum of body
⇒
Therefore the seat belt exerts a force of -4718.28N on the person
The<u> negative sign</u> signifies that seat belt exerts force in opposite direction of Force
S= 1/2 x 182 x t = 1688.3
t = 1688.3 / 91
time = 18.55 seconds
The formula for the critical angle is:
sin (critical angle) = refractive index of solution / refractive index of air
=> refractive index of solution / refrative index of air = sin (48°)
=> refractive index of solution / refractive index of air = 0.7431
=> refractive index of solution = 0.7431 * refractive index of air
=> refractive index of solution = 0.7431 * 1.00
=> refractive index of solution = 0.74
Answser: 0.74
Answer:
• 36.4 kg of coal.
• 80 pounds of coal.
Explanation:
Using proportionality constant,
Mass of coal = 1,000,000/27,500,000 btus/metric ton
= 0.0364 metric tons of coal
Mass of coal = 1,000,000/25,000,000 btus/ton
= 0.04 tons of coal.
Converting metric tons to kilogram,
1 metric ton = 1000kg,
0.0364 metric ton;
= 36.4 kg of coal.
Converting tons to pounds,
1 ton = 2000 pounds,
0.04 metric ton;
= 80 pounds of coal.
Answer:
distance is 300 m and displacement is 100 m
Explanation: