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Gala2k [10]
3 years ago
9

HELP FAST Analyze: A car is moving on a straight road at a constant speed (no change in speed) in a single direction (no change

in direction). The car's speed is 80 km / h. Ahmed claimed that the car is accelerating. Hani disagreed with Ahmed, saying the car is not accelerating. Analyze & Evaluate: Whose claim is true? Explain the reason.
Physics
1 answer:
Anni [7]3 years ago
8 0

Explanation:

Hani is correct because the car is not accelerating as the car is moving in constant speed with no change in speed or velocity and no change in direction thank you

please mark the brainliest

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Pls help A ball rolls horizontally off a 100-meter-tall cliff at 40 meters per second. How far does the ball travel horizontally
svet-max [94.6K]

First find the time it takes for the ball to reach the ground using the vertical component of its position vector:

y=y_0+v_{0y}t+\dfrac12a_yt^2

\implies0=100\,\mathrm m+\dfrac12\left(-9.8\,\dfrac{\mathrm m}{\mathrm s^2}\right)t^2

\implies t=4.52\,\mathrm s

Meanwhile, the horizontal component of the ball's position vector is

x=x_0+v_{0x}t+\dfrac12a_xt^2

\implies x=\left(40\,\dfrac{\mathrm m}{\mathrm s}\right)t

After about 4.52 s, the ball has traveled a horizontal distance of

x=\left(40\,\dfrac{\mathrm m}{\mathrm s}\right)(4.52\,\mathrm s)=180.8\,\mathrm m

which you would round to 200 m, so the answer is B.

8 0
3 years ago
A charge q = 3 × 10-6 C of mass m = 2 × 10-6 kg, and speed v = 5 × 106 m/s enters a uniform magnetic field. The mass experiences
NeX [460]

Answer:

Magnetic field, B = 0.004 mT

Explanation:

It is given that,

Charge, q=3\times 10^{-6}\ C

Mass of charge particle, m=2\times 10^{-6}\ C

Speed, v=5\times 10^{6}\ m/s

Acceleration, a=3\times 10^{4}\ m/s^2

We need to find the minimum magnetic field that would produce such an acceleration. So,

ma=qvB\ sin\theta

For minimum magnetic field,

ma=qvB

B=\dfrac{ma}{qv}

B=\dfrac{2\times 10^{-6}\ C\times 3\times 10^{4}\ m/s^2}{3\times 10^{-6}\ C\times 5\times 10^{6}\ m/s}

B = 0.004 T

or

B = 4 mT

So, the magnetic field produce such an acceleration at 4 mT. Hence, this is the required solution.

4 0
3 years ago
The moon is not seen at all on the new moon.why???​
tino4ka555 [31]

<u>The moon is not seen at all on the new moon because:</u>

The moon itself doesn't make a light, it reflects sunlight. At the point when the moon lies between the Earth and the Sun, it is just the posterior of the moon that is light by the Sun. In this circumstance, the side of the moon confronting the Earth can't mirror any light whatsoever and seems dull.  

The distinction between another moon and a sunlight based over-shadowing is during a sun oriented obscuration, the moon is actually in the position to completely obstruct the sun during the day.

5 0
3 years ago
One twin sets off on a long space voyage traveling at 0.9 c, while the other stays on Earth. When she returns 60 years later, th
Sergio [31]

Answer:

This is the twin paradox.

3 0
3 years ago
In uniform circular motion, which of the following are constant:Check all that apply.Check all that apply.the speed is constantt
AlladinOne [14]

Answer:

The speed, magnitude of the velocity, magnitude of the angular velocity, magnitude of the centripetal acceleration, magnitude of the net force and direction of the angular velocity are constant.

Explanation:

In uniform circular motion we have a centripetal acceleration of constant magnitude but changing direction (since it points to the center of the circle from the object). The same goes for the net (centripetal) force since F=ma. This makes the magnitude of the velocity (speed) constant but its direction changes, although keeping spinning in the same direction, which makes its angular velocity constant in both magnitude and direction.

3 0
4 years ago
Read 2 more answers
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