Pls help! Urgent and giving brainliest!

A truck covers 40.0 m in 7.45 s while uniformly slowing down to a final velocity of 3.50 m/s.

astra-53 [7]

Answer:

(A) Original velocity will be 7.244 m /sec

(B) Acceleration will be $-0.5026m/sec^2$

Explanation:

We have given distance covers by truck s = 40 m

Time taken by truck to cover this distance t = 7.45 sec

Final velocity v = 3.50 sec

According to second equation of motion

$S=ut+\frac{1}{2}at^2$

$40=u\times 7.45+\frac{1}{2}\times a\times 7.45^2$

$7.45u+27.751a=40$ -----eqn 1

According to first equation of motion

v = u + at

So $3.5=u+7.45a$ -----eqn2

Solving equation 1 and 2

a = $-0.5026m/sec^2$

And u = 7.244 m /sec

(A) Original velocity will be 7.244 m /sec

(B) Acceleration will be

$-0.5026m/sec^2$

6 0

4 years ago

If a fully loaded shopping cart has a head-on collision with an empty cart both moving at the same speed toward each other, whic

Pavel [41]

Answer:

impact- equal

impulse- equal

momentum- equal

acceleration- the empty cart

7 0

4 years ago

List and briefly explain the incidents leading to the occurrence of any five nuclear accidents that have taken place in differen

maria [59]

Answer:

Chernobyl Nuclear Disaster Nuclear Disaster.
Japan 2011
Kyshtym Nuclear Disaster. Russia 1957
Windscale Fire Nuclear Disaster. Sellafield, UK 1957
Three Mile Island Nuclear Accident. Pennsylvania, USA 1979

Explanation:

Hope this helps... pls vote as brainliest

7 0

3 years ago

A fixed mass of an ideal gas has a volume of 800 cm3 under certain conditions. The pressure (in kPa) and temperature (in K) are

Mashutka [201]

Answer:

800cm3

Explanation:

This is a general gas law question

Which has the relationship P1V1/T1 = P2V2/T2

P1= P1 in kPa

T1 = T1 in K

V1= 800cm3

V2=?

P2= 2* P1

T2= 2*T1

The volume of gas after the changes (V2), making it as the subject of formula

V2= P1*V1*T2/P2*T1

V2 = P1 *800* 2T1 / 2P1 * T1 ; dividing accordingly, we have

V2 = 800cm3

3 0

4 years ago

What does the Q stand for in the enthalpy of fusion equation?

pychu [463]

The Q in the enthalpy of fusion equation stands for heat energy absorbed or released.

<h3>What is enthalpy?</h3>

In thermodynamics, enthalpy is a measure of the heat content of a chemical or physical system.

The enthalpy of fusion is the amount of heat energy required to convert a unit mass of a solid at its melting point into a liquid without an increase in temperature.

Its units are usually Joules per gram (J/g) or calories per gram (cal/g).

The enthalpy of fusion equation is given as follows:

Q = m·ΔHf

Where;

Q = heat energy
m = mass
ΔHf = heat of fusion

Therefore, the Q in the enthalpy of fusion equation stands for heat energy absorbed or released.

Learn more about enthalpy of fusion at: brainly.com/question/20897184

#SPJ1

3 0

2 years ago