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2 years ago

A velocity-time graph is shown below:

Physics

1 answer:

vlabodo [156]2 years ago

7 0

The average acceleration in the first 10 seconds of the journey is 2 m/s²; option B.

<h3>What is acceleration?</h3>

Acceleration is the rate of change of velocity with time.

<h3>Acceleration = change in velocity/time</h3>

From the graph;

Acceleration in first seconds = 20 - 0/5 = 4 m/s²

Acceleration in second 5 seconds = 0

Average acceleration = 4 + 0/2

Average acceleration = 2 m/s²

In conclusion, average acceleration is the average of the final and initial acceleration.

Learn more about acceleration at: brainly.com/question/14344386

#SPJ1

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A science student is riding on a flatcar of a train traveling along a straight horizontal track at a constant speed of 10.5 m/s.

lesantik [10]

Answer:

Height as seen by the professor = 38.2 m

Explanation:

Angle of throw = θ = 69°

Velocity of throw = v

X component of velocity = v₁ = v cos 69 = 0.3584 v m/s

Vertical component of the velocity = v₂ = v sin 69 = 0.9336 v m/s

v₂ / v₁ = tan 69 = 2.605

v₂ = 2.605 v₁.

Professor sees as if the x component of velocity =0

v (as seen by professor) + v' = 0

=> v as seen by professor = -v' = -10.5 m/s

This shows that y component of the ball's velocity is 2.605 times its x component of velocity.

with respect to the professor, there is only y component of velocity.

v₂' =v₂ = 2.605 ( -10.5) = 27.4 m/s.

Height as seen by the professor = (27.4)² / 2(9.8) = 38.2 m

4 0

4 years ago

A book falls off the desk and makes a sound when it hits the floor. The sound wave that travels through the air is

Andreas93 [3]

The sound wave that travel through the are is called the <em>amplitude</em> or <em>frequency you can use either of them because there both correct.</em>

6 0

4 years ago

Read 2 more answers

What is the net charge?

aivan3 [116]

To find the net charge you take the number of protons and subtract the number of electrons, and the answer will be your charge.

This atom has 11 electrons AND 11 protons
11 - 11 = 0 net charge

6 0

3 years ago

Anika asks Eva to roll a basketball and then a bowling ball to her. Which requires more force to roll, and why?

Paul [167]

It's easy to roll the the basket ball than bowling ball

It is because bowling ball is solid spherical ball which will have less moment of inertia

its moment of inertia is given as

$I = \frac{2}{5}mR^2$

While for the hollow ball like basketball we know that moment of inertia is given as

$I' = \frac{2}{3}mR^2$

so here we can see for the same mass if we take basketball then its moment of inertia is more so it is easy to roll basket ball then to roll bowling ball.

So it is easy to roll basket ball then rolling ball

6 0

4 years ago

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The drinking water needs of an office are met by cooling tab water in a refrigerated water fountain from 23 to 6°C at an average

Ratling [72]

Answer:

The correct option is;

Explanation:

Here we have the Coefficient Of Performance, COP given by

$COP = \frac{Q_{cold}}{W} = 3.1$

The heat change from 23° to 6°C for a mass of 10 kg/h which is equivalent to 10/(60×60) kg/s or 2.78 g/s we have

$Q_{cold}$ = m·c·ΔT = 2.78 × 4.18 × (23 - 6) = 197.39 J

Therefore, plugging in the value for $Q_{cold}$ in the COP equation we get;

$COP = \frac{197.39 }{W} = 3.1$ which gives

$W = \frac{197.39 }{3.1} = 63.674 \ J$

Since we were working with mass flow rate then the power input is the same as the work done per second and the power input to the refrigerator = 63.674 J/s ≈ 64 W.

The power input to the refrigerator is approximately 64 W.

4 0

3 years ago

Read 2 more answers