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2 years ago

Please help me with this question

Physics

1 answer:

Zina [86]2 years ago

4 0

Answer:

D. The truck and trailer will experience a net force of 40 newtons backward

Explanation:

Taking the greatest force (trailer), and subtracting it by the smaller force (truck), we can find how many newtons the greater force is applying to pull the whole system:

2,790 - 2,750 = 40 N

Since we know that the trailer is the greater force, the truck & trailer are being pulled backwards by 40 Newtons

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2. Compare and contrast the three different types of spectra.

Ber [7]

Answer:

y u ask this

Explanation:

6 0

2 years ago

While skiing in Jackson, Wyoming, your

grin007 [14]

Hello!

Work is equal to negative change in PE and PE=mgh and Power is change in work/change in time

So we have

56.1kg * 9.80m/s^2 * 16m = 8796.5 J of PE at top of run and -8796.5J of work done also

if it takes him 12s then we need to find the time gravity alone would bring him to the bottom. we get

16m=1/2at^2 and solving for t we get
t=sqrt(32/9.80m/s^2)=1.81s

so the difference in time is 12-1.8=11.2s

now we can find avg power=work/time = 8796.5J/11.2s = 785W or 785J/s

Hope this helps! Any questions please ask! Thank you!

8 0

2 years ago

Part A What is the resistance of a 4.4 m length of copper wire 1.3 mm n diameter? The resistivity of copper is 1.68x 10-8 Ω-m Ex

Natalija [7]

Explanation:

It is given that,

Length of the copper wire, l = 4.4 m

Diameter of copper wire, d = 1.3 mm = 0.0013 m

Radius of copper wire, r = 0.00065 m

The resistivity of the copper wire, $\rho=1.68\times 10^{-8}\ \Omega-m$

We need to find the resistance of the copper wire. It is given by :

$R=\rho\dfrac{l}{A}$

$R=1.68\times 10^{-8}\ \times \dfrac{4.4\ m}{\pi (0.00065)^2}$

R =0.055 ohms

So, the resistance of the copper wire is 0.055 ohms. Hence, this is the required solution.

7 0

2 years ago

In a crash test, a 1000 kg automobile moving at 10 m/s crashes into a brick wall. How much energy goes into demolishing and warm

marishachu [46]

Answer:

Explanation:

Given

mass of automobile $m=1000\ kg$

velocity of automobile $v=10\ m/s$

If the automobile crashes into the brick wall then it's kinetic energy is converted into thermal and demolishing energy to wall.

Car completely stops as it crashes into the wall so Energy converted into demolition and thermal energy

$E=\frac{1}{2}mv^2$

$E=\frac{1}{2}\times 1000\times (10)^2$

$E=50\ kJ$

8 0

2 years ago

According to Newton’s first law of motion, when will an object at rest begin to move?

soldi70 [24.7K]

2. When an unbalanced force acts upon it

Think of a glass of milk resting on a table. The glass weighs a certain amount more due to the load it carries. It would be unaffected until and unbalanced force (such as a hand) carelessly knocks it over spilling the contents.

Hope this helps :)

6 0

2 years ago