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natulia [17]
3 years ago
8

A body travels 10 meters during the first 5 seconds of its travel, and it travels a total of 30 meters over the first 10 seconds

of its travel. What is
its average speed during the time from t = 5 seconds to t = 10 seconds?
A.
2 meters/second
B.
3 meters/second
c. 4 meters/second
D. 5 meters/second
E. 6 meters/second
Physics
1 answer:
Nesterboy [21]3 years ago
7 0

Answer:

c. 4 meters/second

Explanation:

The formula to calculate average speed is:

s = \frac{x_{2} - x_{1}  }{ t_{2} - t_{1}  }

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A person holds a ladder horizontally at its center. Treating the ladder as a uniform rod of length 4.15 m and mass 7.98 kg, find
Ludmilka [50]

Answer:

4.535 N.m

Explanation:

To solve this question, we're going to use the formula for moment of inertia

I = mL²/12

Where

I = moment of inertia

m = mass of the ladder, 7.98 kg

L = length of the ladder, 4.15 m

On solving we have

I = 7.98 * (4.15)² / 12

I = (7.98 * 17.2225) / 12

I = 137.44 / 12

I = 11.45 kg·m²

That is the moment of inertia about the center.

Using this moment of inertia, we multiply it by the angular acceleration to get the needed torque. So that

τ = 11.453 kg·m² * 0.395 rad/s²

τ = 4.535 N·m

8 0
3 years ago
The length of a rectangle is four times its width. The perimeter of the rectangle is at most 130 cm. Which inequality models the
leva [86]
The answer would be the one where the left side is less than or equal to 130 because 130 has to be the greatest value and the value of the w's cannot exceed 130, but they can equal it
4 0
3 years ago
Two technicians are explaining the information on a repair order. Technician A says that the cause written on the repair order i
bezimeni [28]
Technician A and B are correct . Because according to technician A, the cause written on the repair order is a diagnosis. Here, by diagnosis, he means that the problem is identified after examining the device and hence the judgement is made.
And according to B, you have to write the cause of the problems in the device that have been identified and the concern measures, which is also kind of diagnosis.

So, option D is correct.
4 0
3 years ago
What is the daily use of the deltoid?
Ghella [55]

Answer:

In our everyday life, the deltoids take on most of the work in rotating our arms, but besides that the deltoid muscle also allows us to carry objects at a safe distance from the body. It is also responsible from stopping a dislocation or injury to the humerus when we carry something heavy.

6 0
3 years ago
Read 2 more answers
What frequency is received by the ambulance after reflecting from a wall near the person watching the oncoming ambulance (as in
Zepler [3.9K]

Answer:

900.48925 Hz

979.9785 Hz

Explanation:

v_a = Relative velocity of ambulance =109\ km/h=\dfrac{109}{3.6}

v_w = Velocity of wall = 0

v = Velocity of sound in air = 343 m/s

From doppler effect we have

f=f'\dfrac{v+v_w}{v-v_a}\\\Rightarrow f=821\dfrac{343+0}{343-\dfrac{109}{3.6}}\\\Rightarrow f=900.48925\ Hz

The frequency of sound is 900.48925 Hz

When the wall acts like a source

f=f'\dfrac{v+v_a}{v-v_w}\\\Rightarrow f=900.48925\dfrac{343+\dfrac{109}{3.6}}{343-0}\\\Rightarrow f=979.9785\ Hz

The frequency of sound is 979.9785 Hz

4 0
3 years ago
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