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4 years ago

Why does a curve on a distance-time graph indicate acceleration

Physics

1 answer:

Anon25 [30]4 years ago

6 0

... Speeding up or slowing down are two of the three forms of acceleration.

... The SLOPE of the line on a distance/time graph is the object's speed.

... If the graph is curved, then its slope is changing.

That means the object's speed is changing.

That means the object is accelerating.

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Where will you find the most kinetic energy? ice or water?

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Answer:

Water has more kinetic energy because it is liquid, as ice is harder, so it's cells can't move as much.

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3 years ago

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What are conduction, convection and radiation?

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Those are the three ways that heat can move
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3 years ago

A particle is moving along a circular path of 2-m radius such that its position as a function of time is given by u = (5t 2) rad

OverLord2011 [107]

Answer:

Explanation:

Given

radius of path $r=2\ m$

Velocity of Particle $\theta =5t^2 rad$

where t=time in seconds

angular velocity of particle is given by

$\omega =\frac{\mathrm{d} \theta }{\mathrm{d} t}$

$\omega =2\times 5t=10\cdot t$

And angular acceleration is given by

$\alpha =\frac{\mathrm{d} \omega }{\mathrm{d} t}$

$\alpha =10 rad/s^2$

tangential acceleration is $a_t=\alpha \times r$

$a_t=10\times 2=20\ m/s^2$

Centripetal acceleration $a_c=\omega ^2\times r$

$a_c=(10t)^2\times 2=200t^2$

net acceleration is sum of tangential and centripetal force at any time t is given by

$a_{net}=\sqrt{(a_c)^2+(a_t)^2}$

$a_{net}=\sqrt{(200t)^2+(20)^2}$

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3 years ago

Christopher drives into the city to buy new new hockey equipment. Because of traffic conditions, he averages only 15 mph. On the

alina1380 [7]

Answer:

36 minutes

Explanation:

Distance= Time*Speed

Let time taken to go to city be x hours, therefore, time to travel back is (2-x) hours

The distance to and from the city are equal hence

15x=35(2-x)

15x=70-35x

50x=70 hence x=70/50=1.4 hours

Time to drive home will be 2-x=2-1.4=0.6 hours

0.6*60=36 minutes

Therefore, time to travel back home is 36 minutes

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3 years ago

A machine can never be 100% efficient because some work is always lost due to which factor?

Pachacha [2.7K]

Answer:

A. can never be efficient due to friction

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