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3 years ago

1) help me please!!!!

Mathematics

2 answers:

boyakko [2]3 years ago

8 0

I think that it’s b??

Scilla [17]3 years ago

7 0

Answer:

Step-by-step explanation:

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A 4000 kg truck is parked on a 7.0° slope. How big is the friction force on the truck?

Lelu [443]

Answer:

4777.28 N

Step-by-step explanation:

The gravitational force down the slope is given by the formula;

(mass *g * sin θ )

where;

θ is the angle of inclination of the slope

g is the gravitational pull

We plug in the given values into the above expression;

(4,000 x 9.8 x sin 7) = 4777.28 N.

The frictional force must equal to 4777.28 N (pointing up the slope).

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3 years ago

State the quadrent or axis that each point lies in. (3,1)

iVinArrow [24]

3 is on quadrant 1 on the x axis. And 1 is on quadrant 1 on the y axis

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3 years ago

A sound wave is traveling at 6,420m/s and has a frequency of 600Hz. What is the wavelength?

GaryK [48]

Answer:

10.7 m

Step-by-step explanation:

Given that,

The speed of a sound wave, v = 6,420 m/s

The frequency of the wave, f = 600 Hz

We need to find the wavelength of the wave. We can find it using the below relation as follows :

$v=f\lambda\\\\\lambda=\dfrac{v}{f}\\\\\lambda=\dfrac{6420}{600}\\\\\lambda=10.7\ m$

So, the wavelength of the sound wave is equal to 10.7 m.

4 0

3 years ago

The cost of a new smart watch at Walmart is

ludmilkaskok [199]

Answer: $50.50

Step-by-step explanation:

$250.49-$199.99=$50.50

7 0

3 years ago

Please help, I really need this

Nady [450]

9514 1404 393

Answer:

(a) -- the correct choice is highlighted

Step-by-step explanation:

The units of specific heat tell you what quantities make up the ratio.

$\dfrac{390\text{ J}}{1\text{ kg$\cdot^\circ$C}}=\dfrac{-12.0\text{ J}}{0.012\text{ kg}\cdot\Delta T}\\\\\Delta T=\dfrac{-12.0}{0.012\cdot390}\ ^\circ\text{C}\approx-2.56\text{ $^\circ$C}$

The temperature will decrease by 2.56 C.

4 0

3 years ago