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4 years ago

10

What measurements or observations tells you that a car is accelerating

2 answers:

lutik1710 [3]4 years ago

8 0

You need to observe the car at two different times.

-- The first time:
You write down the car's speed, and the direction it's pointing.

-- The second time:
You write down the car's speed and the direction it's pointing, again.

You take the data back to your lab to analyze it.

-- You compare the first and second speed. If they're different,
then the car had acceleration during the time between the two
observations.

-- You compare the first and second direction. If those are different,
even if the speeds are the same, then the car had acceleration during
the time between the two observations.

(Remember, "acceleration" doesn't mean "speeding up".
It means any change in speed or direction of motion.)

PtichkaEL [24]4 years ago

7 0

<span>Frame of reference. It</span> uses the second law of motion to determine whether it is moving or not...

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A racecar accelerates uniformly from 18.5 mil to 46.1 m/s in 2.47 seconds.

laiz [17]

Answer:

<em>The acceleration of the racecar is</em> $\mathbf{11.17~m/s^2}$

Explanation:

<u>Uniformly Accelerated Motion</u>

It's a type of motion in which the velocity of an object changes by an equal amount in every equal period of time.

Following the definition above, the acceleration is defined as:

$\displaystyle a=\frac{v_f-v_o}{t}$

Where a is the constant acceleration, vo the initial speed, vf the final speed, and t the time.

The racecar goes from vo=18.5 m/s to vf=46.1 m/s in t=2.47 seconds, thus the acceleration is:

$\displaystyle a=\frac{46.1-18.5}{2.47}$

$\displaystyle a=\frac{27.6}{2.47}$

$a = 11.17~m/s^2$

The acceleration of the racecar is $\mathbf{11.17~m/s^2}$

5 0

3 years ago

An electric slot car has a coil with 100 turns of wire. These loops have a current of 0.1 A and cover an area of 0.1 cm2. If the

Marrrta [24]

Answer:

The torque will be felt by the coil is zero

Explanation:

The torque is:

$\tau =\mu B=\mu Bsin\theta$

Where

μ is the magnetic moment = N * I * A, where N is the number of turns, I is the current and A is the area

A = 0.1 cm² = 1x10⁻⁵m²

$\mu =100*0.1*1x10^{-5} =1x10^{-4} Am^{2}$

If the angle between the area and the magnetic field is 0 (are in parallel), then:

$\tau =1x10^{-4} *1*sin0=0Nm$

3 0

3 years ago

A helium balloon is filled to a volume of 2.88 x 103 L at 722 mm Hg and 19Â°C. When the balloon is released, it rises to an alti

inn [45]

Answer:

V₂=4.57 x 10³ L

Explanation:

Given that

V₁= 2.88 x 10³ L

P₁=722 mm Hg

T₁ = 19°C

T₁ =292 K

P₂=339 mm Hg

T₂= - 55°C

T₂=218 K

Lets take final volume = V₂

We know that ideal gas equation

PV = m R T

By applying mass conservation

$\dfrac{P_1V_1}{RT_1}=\dfrac{P_2V_2}{RT_2}$

$\dfrac{722\times 2.88\times 10^3}{292}=\dfrac{339\times V_2}{218}$

V₂=4.57 x 10³ L

Therefore volume will be 4.57 x 10³ L

3 0

3 years ago

Which of the following has the greatest momentum?

vova2212 [387]

Answer:

A

Explanation:

Momentum is mass times velocity.

A. 275 kg × 0.55 m/s = 151.25 kgm/s

B. 2.7 kg × 7.5 m/s = 20.25 kgm/s

C. 91 kg × 1.4 m/s = 127.4 kgm/s

D. 1.8 kg × 6.7 m/s = 12.06 kgm/s

So A has the greatest momentum.

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3 years ago

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What simple machine is a fishing pole?

elena55 [62]

<span>A fishing pole is made up of 3 simple machines, it is a 3rd class lever, a pulley and a wheel and axle which is your reel.</span>

7 0

4 years ago

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