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zhuklara [117]
3 years ago
11

Your forehead can withstand a force of about 6.0 kN before fracturing, while your cheekbone can only withstand about 1.3 kN .

Physics
1 answer:
Thepotemich [5.8K]3 years ago
8 0

Answer:

Explanation:

Maximum force for forehead = 6 kN

maximum force for cheek bone = 1.3 kN

Part A:

mass of base ball, m = 140 g = 0.14 kg

initial velocity of base ball, u = 30 m/s

final velocity of base ball, v = 0

Time, t = 0.0015 s

Acceleration is defined a the rate of change of velocity.

Use first equation of motion

v = u + at

0 = 30 + a x 0.0015

a = - 20000 m/s²

Part B:

Force = mass x acceleration

F = 0.140 x 20000

F = 2800 N

Part C:

Force applied on your head is 2800 N.

Part D:

As the force is 2800 N that means 2.8 kN which is less than 6 kN so you are safe.

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A dog starts at the origin and runs forward at 6m/s for 1.5s and then turns around to fetch the ball by running backward at 7m/s
Vera_Pavlovna [14]

Answer:

Total time elapsed between the start and when he returns with the ball is 7.5s

Explanation:

From the question,

- The dog starts at the origin and runs forward at 6m/s for 1.5s. First, we will determine the distance covered while running forward.

From

Speed = Distance / Time

Distance = Speed × Time

Speed = 6m/s

Time = 1.5s

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Distance = 9m

That is, the dog covered a distance of 9m while running forward.

- The dog turns around and runs backward at 7m/s for 3s. Now, we will also determine the distance the dog covered backwards.

Distance = Speed × Time

Speed = 7m/s

Time = 3s

Distance = 7m/s × 3s

Distance = 21m

The dog's displacement from the origin is 21m - 9m = 12m

Now, to calculate how much time has elapsed between the start if the dog runs back to the origin at 4m/s, we will first determine the time the dog spent back to the origin and then add to the time spent for the first two distances.

To get back to the origin, the dog needs to cover 12m

From

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Time = Distance / Speed

Distance = 12m

Speed = 4m/s

∴ Time = (12m) / (4m/s)

Time = 3s

Therefore, the dog spent 3s to run back to the origin.

Hence, total time elapsed = 1.5s + 3s + 3s

Total time elapsed = 7.5s

8 0
3 years ago
Free Test Answers!!
Darina [25.2K]

Answer:

Thank you very much.

Explanation:

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A student conducts an experiment in which a cart is pulled by a variable applied force during a 2 s time interval. In trial 1, t
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Answer:

The answer is "Including all three studies of 0s to 2s, that shift in momentum is equal".

Explanation:

Its shift in momentum doesn't really depend on the magnitude of its cars since the forces or time are similar throughout all vehicles.

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F = m a\\\\a =\frac{F}{m}

We use movies and find lips

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Let's replace the speeds in this equation

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AleksAgata [21]

Answer:

B.C. D. G.

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