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3 years ago

Which of the following objects is accelerating?

2 answers:

8 0

Accelerating means it is gaining speed

The only one that is gaining speed here is C
a flower pot falling from a second story window

Deffense [45]3 years ago

5 0

Answer : The correct options are, (b) and (c)

Explanation :

Acceleration can be defined as the rate change of velocity. It is a vector quantity. when either the speed or direction or both changes for a body, it is said to accelerate.

In option a, a car is moving with constant speed in a single direction. Hence, it is not accelerating.

In option b, through car is moving with constant speed but it is moving on a curved path which means its direction is changing. Hence, it is accelerating.

In option c, the flower pot is falling through second story. It is falling under gravity. it is accelerating due to gravity.

In option d, statue in center of park is at rest. Hence, it is not accelerating.

Thus, correct options are b and c.

You might be interested in

A 0.453 kg pendulum bob passes through the lowest part of its path at a speed of 2.58 m/s. What is the tension in the pendulum c

harkovskaia [24]

Answer with Explanation:

Mass of pendulum bob, m=0.453 kg

Speed, $v_1=$ 2.58 m/s

a.r=75.1 cm= $75.1\times 10^{-2}m$ =0.751 m

$1cm=10^{-2} m$

Tension in the pendulum cable is given by

Tension=Centripetal force+force due to gravity

$T=\frac{mv^2}{r}+mg$

Where $g=9.8 m/s^2$

Substitute the values

$T=\frac{0.453(2.58)^2}{75.1\times 10^{-2}}+0.453\times 9.8$

$T=8.45 N$

b.When the pendulum reaches its highest point,then

Final velocity, $v_2=0$

According to law of conservation of energy

$mgh_1+\frac{1}{2}mv^2_1=mgh_2+\frac{1}{2}mv^2_2$

$gh_1+\frac{1}{2}v^2_1=gh_2+\frac{1}{2}v^2_2$

$h_1=0$

Substitute the values

$9.8\times 0+\frac{1}{2}(2.58)^2=9.8\times h_2+\frac{1}{2}(0)^2$

$3.3282=9.8h_2$

$h_2=\frac{3.3282}{9.8}=0.34 m$

The angle mad by cable with the vertical= $cos\theta=\frac{0.751-0.34}{0.751}=0.55$

$\theta=cos^{-1}(0.55)=56.6^{\circ}$

c.When the pendulum reaches at highest point then

Acceleration, a=0

Therefore, the tension in the pendulum cable

$T=mgcos\theta$

Substitute the values

$T=0.453\times 9.8cos56.6$

$T=2.4 N$

8 0

3 years ago

The plate tectonic theory was initially rejected. TRUE. FALSE?

Sveta_85 [38]

This is true.
Hope this helps

3 0

3 years ago

As a cold air mass advances on a warm air mass, what usually comes before it?

Marina CMI [18]

Answer: A cold front occurs when a cold air mass advances into a region occupied by a warm air mass. If the boundary between the cold and warm air masses doesn't move, it is called a stationary front.

Explanation: Two types of occluded front exist: the warm-type and the cold-type. They’re distinguished by the relative temperatures of the air mass ahead of the occlusion – in other words, the air mass ahead of the original warm front – and the air mass behind the cold front. If the air behind the cold front is colder than the air ahead of the occlusion, it shoves beneath that air (because it’s denser) to form a cold-type occluded front. If the air behind the cold front is warmer than the air ahead, it rides over it to form a warm-type occluded front – which appears to be the more common case. In either situation, the lighter warm air representing the air mass originally between the warm and cold fronts sits above the boundary between the two cooler air masses.

Hope this helps!!

8 0

3 years ago

Every thing is in the picture

vekshin1

Answer:

156

Explanation:

74+82=156

5 0

3 years ago

How do foraminifera found in rock layers above the k-t boundary compare to those in rock layers below?

creativ13 [48]

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.

Below are the choices that can be found elsewhere:

Foraminifera above the boundary are larger and more diverse than those below.
Foraminifera above the boundary are larger and less diverse than those below.
Foraminifera above the boundary are smaller and more diverse than those below.
<span>Foraminifera above the boundary are smaller and less diverse than those below

The answer is </span>Foraminifera above the boundary are smaller and less diverse than those below
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8 0

4 years ago