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3 years ago

Does these 2 questions mean the same thing?

Physics

2 answers:

Nataly_w [17]3 years ago

8 0

No because one is asking what moves it and the other is asking for its energy source.

Lilit [14]3 years ago

3 0

Yea, im pretty sure they mean the same.

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What is the final velocity of a car that is originally traveling 12 m/s and then undergoes an acceleration of 2.3m/s squared for

Katarina [22]

To solve this problem we use the general kinetic equations.

We need to know the time it takes for the car to reach 130 meters.

In this way we have to:

$x(t) = x_0 + v_0t + 0.5at ^ 2$

Where

$x_0$ = initial position

$v_0$ = initial velocity

$a$ = acceleration

$t$ = time

$x(t)$ = position as a function of time

$130 = 0 + 12(t) + 0.5(2.3)t ^ 2$

$1.15t ^ 2 + 12t - 130$ .

We use the quadratic formula to solve the equation.

$t = \frac{-12 \± \sqrt {(12) ^ 2-4(1.15)(- 130)}}{2 (1.15)}$

t = 6.63 s and t = -17.1 s

We take the positive solution. This means that the car takes 6.63 s to reach 130 meters.

Then we use the following equation to find the final velocity:

$v_f = v_0 + at$

Where:

$v_f$ = final speed

$v_f = 12 +2.23(6.63)$

The final speed of the car is 27.25 m/s

3 0

3 years ago

Odtake them for freee

Stolb23 [73]

Answer:

Thank youu89okkiiiooo

5 0

3 years ago

Read 2 more answers

A gas is confined in a cylinder with a piston. What happens when work is done on the gas.

goblinko [34]

It combusts in to a vapor

5 0

3 years ago

Read 2 more answers

A paintball is shot horizontally in the positive x direction at time t after the ball is shot it is 4 cm to the right and 4 cm b

Artist 52 [7]

<u>Answer:</u>

At time 2t the paint ball is at 8 cm to the right and 16 cm to the bottom

<u>Explanation:</u>

We have equation of motion , $s= ut+\frac{1}{2} at^2$ , s is the displacement, u is the initial velocity, a is the acceleration and t is the time.

Considering the horizontal motion of paint ball

Distance traveled during time t = 4 cm

Initial velocity = u m/s

Acceleration = 0 $m/s^2$

So $4 = u*t+\frac{1}{2} *0*t^2\\ \\ u = \frac{4}{t}$

Now at time 2t,

$S= u*2t+\frac{1}{2} *0*(2t)^2\\ \\=\frac{4}{t} *2t\\ \\ =8cm$

So horizontal distance traveled in time 2t = 8 cm to the right

Now considering the vertical motion of paint ball

Distance traveled during time t = 4 cm

Initial velocity = 0 m/s

Acceleration = -g $m/s^2$

$4=0*t-\frac{1}{2} *g*t^2\\ \\ t^2=\frac{-8}{g}$

At time 2t,

$S=0*2t-\frac{1}{2} *g*(2t)^2\\ \\ =-\frac{1}{2} *g*4*\frac{-8}{g}\\ \\ =16 cm$

So vertical distance traveled in time 2t = 16 cm to the bottom

6 0

3 years ago

Which choice correctly describes what happens during heating?

Masja [62]

Answer:

Option 4

Explanation:

During heating actually heat transfer takes place from a body at higher temperature to a body at lower temperature and the heat transfer takes place until both attain the same temperature

Therefore heat transfer depends on the temperature of the systems

Now while comparing the thermal energies of the systems, if both the systems have same mass then the system which is at higher temperature has greater thermal energy when compared to the system which is at lower temperature

So in this case assuming that both the systems have same mass then the energy will leave the system with greater thermal energy and go into the system with less thermal energy as the system with greater thermal energy in this case will be at higher temperature and we are considering this assumption because thermal energy not only depends on temperature but also depends on mass of the system

7 0

4 years ago