Answer:
a.) F = 3515 N
b.) F = 140600 N
Explanation: given that the
Mass M = 74kg
Initial velocity U = 7.6 m/s
Time t = 0.16 s
Force F = change in momentum ÷ time
F = (74×7.6)/0.16
F = 3515 N
b.) If Logan had hit the concrete wall moving at the same speed, his momentum would have been reduced to zero in 0.0080 seconds
Change in momentum = 74×7.6 + 74×7.6
Change in momentum = 562.4 + 562.4 = 1124.8 kgm/s
F = 1124.8/0.0080 = 140600 N
Answer:
90km
Explanation:
every hour you travel 30km and you are traveling 3 hours 30×3
Answer:
The area of the liquid surface does not affect the pressure.
The main difference between mechanical and electromagnetic waves is that mechanical waves require a medium in order to propagate, while electromagnetic waves can propagate also in vacuum.
Examples of telecommunication via mechanical waves are sound waves (so, two people speaking to each other, for instance), while examples of telecommunication via electromagnetic waves are the radio waves that transmit the TV signals to the houses.
Answer:
a. I = -3mv₀/2 b. F = -3mv₀/2t
Explanation:
a. Use the impulse-momentum to write an equation for the system which is the cart only.
We know Impulse , I = Δp where Δp = change in momentum.
Now, Δp = m(v - u) where m = mass of cart, u = initial velocity of cart = v₀ and v = rebound velocity of cart = -v₀/2 (negative since it moves in the opposite direction to u)
So, I = Δp = m(v - u)
Substituting the values of the variables into the equation, we have
I = m(-v₀/2 - v₀) = -3mv₀/2
So, I = -3mv₀/2
b. If the time during which the bumper exerts a force on the cart is t, write an expression for the force F exerted on the cart in terms of the given variables.
We know impulse I = Ft where F = force exerted on the cart and t = time force acts
Also, I = -3mv₀/2
So, Ft = -3mv₀/2
F = -3mv₀/2t