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2 years ago

1Which statement correctly applies to a car that changes its velocity over a period of time?

Physics

2 answers:

slavikrds [6]2 years ago

5 0

Answer:b a nonzero net force is acting on it

Explanation:

ahrayia [7]2 years ago

5 0

1) D; Forces are acting on it.

2) A; Graphs visually show the relationship between the variables under investigation.

1) Velocity is same as speed just that it has direction. Now Newton's first law of motion which is called law of inertia states that an object will continue in its present state of rest rest or remain in constant motion unless an external force acts on it.

This means that for a cars speed to change, according to this law, it means external forces have acted on it.

Thus, option D is correct.

D; Forces are acting on it.

2) We want to show the relationship between force and acceleration using either table or graph.

Now, a table will just use rows and columns to show us the value of a force per given acceleration. It doesn't show us a trend in terms of line or curve like the way graph will show.

This means that graphs give a better visual representation of the relationship between two variables than tables will do.

Thus, option A is correct.

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In Speed Study Number 1, we looked at two cars traveling the same distance at different speeds on city streets. Car "A" traveled

Ganezh [65]

Answer:

230.4 s

Explanation:

The speed of car A is

$v_A = 35 mi/h$

and the distance travelled is

$d = 10 mi$

so the time taken for car A is

$t_A = \frac{d}{v_A}=\frac{10 mi}{35 mi/h}=0.286 h$

The speed of car B is

$v_B = 45 mi/h$

and the distance travelled is

$d = 10 mi$

so the time taken for car B is

$t_B = \frac{d}{v_B}=\frac{10 mi}{45 mi/h}=0.222 h$

So the difference in time is

$\Delta t = t_A - t_B = 0.286 h -0.222 h=0.064 h$

Which corresponds to

$\Delta t = 0.064 h \cdot 3600 s/h = 230.4 s$

so car B arrived 230.4 s before car A.

5 0

3 years ago

How does charging by conduction occur?

tia_tia [17]

Hello!
Charging by conduction involves the contact of a charged object to a neutral object. Suppose that a positively charged aluminum plate is touched to a neutral metal sphere. The neutral metal sphere becomes charged as the result of being contacted by the charged aluminum plate.
Hope this helped!

6 0

3 years ago

Read 2 more answers

Define potentiol energy , kenetic energy.

Pani-rosa [81]

Potential energy is stored energy. For example, if a bowling ball is on top of a giant hill, we say it has potential energy because it has the potential to do work which is to roll down the hill.

Kinetic energy is the energy of movement so once that ball rolls down that hill, that potential energy is converted to kinetic energy.

8 0

2 years ago

Read 2 more answers

Fill-in-the-Blank

padilas [110]

Answer:

Earthquakes

YES

6 0

3 years ago

Read 2 more answers

Two hockey pucks with mass 0.1 kg slide across the ice and collide. Before

RideAnS [48]

The velocity of pluck 1 is 12 m/s west.

<h3>What is the conservation of momentum?</h3>

The principle of the conservation of the linear momentum states that momentum before collision is equal to momentum after collision.

Now given that;

m1u1 + m2u2 = m1v1 + m2v2

(0.1 * 15) - (0.1 * 12) = 0.1* v + (0.1 * 15)

1.5 - 1.2 = 0.1v + 1.5

0.3 - 1.5 = 0.1v

v = -1.2/0.1

v = - 12 m/s

Hence, the velocity of pluck 1 is 12 m/s west.

Learn more about linear momentum:brainly.com/question/27988315

#SPJ1

7 0

1 year ago