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Anestetic [448]
3 years ago
5

A 75.0-kg ice skater moving at 10.0 m/s crashes into a stationary skater of equal mass. After the collision, the two skaters mov

e as a unit at 5.00 m/s. Suppose the average force a skater can experience without breaking a bone is 4 500 N. If the impact time is 0.100 s, does a bone break?
Physics
1 answer:
Ksenya-84 [330]3 years ago
4 0

Answer:

Explanation:

Momentum change for either skater is mΔv = 75.0(5.0) = 375 kg•m/s

As a change in momentum is equal to an impulse

375 = FΔt

F = 375/0.100 = 3750 N

As 3750 N < 4500 N no bones are broken.

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In 2 or 3 sentences, describe how antitrust laws encourage competition.
Zigmanuir [339]
Antitrust laws are used to theoretically protect consumers from businesses that seek to distort the market through unfair practices. Antitrust laws prevent the creation of cartels or groups of companies that work in conjunction to raise the costs of goods above the market value that would occur with competition. The also restrict the mergers and acquisitions of companies that would restrict or inhibit competition if a company were to get too large. And finally these laws prevent the misuse or creation of monopoly power by a single or a few large firms to distort the market and prevent competition and pricing that is deemed to be a fair market price to consumers. 
4 0
4 years ago
he plates each have an area of 2 x 10-3 m2, and the spacing between the plates is 6 x 10-3 m. There is no dielectric between the
Serhud [2]

Complete question:

The left plate of a parallel plate capacitor carries a positive charge Q, and the right plate carries a negative charge -Q. The magnitude of the electric field between the plates is 100 kV/m. The plates each have an area of 2 x 10⁻³ m², and the spacing between the plates is 6 x 10⁻³ m. There is no dielectric between the plates. What is the charge on the capacitor?

Answer:

The charge on the capacitor is 1.77nC

Explanation:

Given;

magnitude of electric field between the plates, E = 100 kV/m

Area of each plate, A = 2 x 10⁻³ m²

Distance between the plates, d = 6 x 10⁻³ m

Charge on the capacitor is calculated as;

Q = CV

V = Ed

C = \epsilon_o \frac{A}{d}

Q = CV =  \epsilon_o \frac{A}{d}*Ed\\\\ Q =  \epsilon_o AE\\\\Q = 8.85*10^{-12} *2*10^{-3}* 100,000\\\\Q = 1.77 *10^{-9} \ C\\Q = 1.77 \ nC

Therefore, the charge on the capacitor is 1.77nC

8 0
4 years ago
a sprinter with a mass of 80kg accelerates uniformly from 0 m/s to 9 m/s in 3 s. a.)what is the runners acceleration? b.) what i
Katyanochek1 [597]
Part A: 
Acceleration can be calculated by dividing the difference of the initial and final velocities by the given time. That is,
             a = (Vf - Vi) / t
where a is acceleration,
Vf is final velocity,
Vi is initial velocity, and
t is time

Substituting,
            a = (9 m/s - 0 m/s) / 3 s = 3 m/s²
<em>ANSWER: 3 m/s²</em>

Part B: 
From Newton's second law of motion, the net force is equal to the product of the mass and acceleration,
               F = m x a
where F is force,
m is mass, and 
a is acceleration

Substituting,
              F = (80 kg) x (3 m/s²) = 240 kg m/s² = 240 N

<em>ANSWER: 240 N </em>

Part C: 
The distance that the sprinter travel is calculated through the equation,
         d = V₀t + 0.5at²

Substituting,
            d = (0 m/s)(3 s) + 0.5(3 m/s²)(3 s)²
             d = 13.5 m

<em>ANSWER: d = 13.5 m</em>

3 0
3 years ago
A motorbike travels 45 miles in 15 minutes, what is its speed (hint change the minutes to hours!!)
Flauer [41]

Answer:

180 miles/hr

Explanation:

15 min=1/4 hr

s= distance/time

s=45miles/1/4 hr

s=45miles x 4/1=180 miles/hr

6 0
3 years ago
Why do liquids solidify when cooled
Zinaida [17]
Because when liquids are cooled the molecules slow down and that causes liquids to freeze

3 0
3 years ago
Read 2 more answers
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