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Goshia [24]
3 years ago
11

Quiz Revisions:

Physics
1 answer:
FrozenT [24]3 years ago
7 0

Answer:

fr = 514.5 N,    This force has the opposite direction to the applied force.

Explanation:

Let's propose the solution of the problem using Newton's Second Law, we place a reference frame with the horizontal x-axis

Y axis

         N- W = 0

         N = W

X axis

         F -fr = m a

         

the friction force has the expression

        fr = μ N

        fr = μ mg

       

        fr = 0.35  150  9.8

        fr = 514.5 N

This force has the opposite direction to the applied force.

The student's answer is incorrect because the friction coefficient must be multiplied by the normal

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6 0
3 years ago
Read 2 more answers
A diffraction grating is illuminated simultaneously with red light of wavelength 660 {\rm nm} and light of an unknown wavelength
Tanzania [10]

Answer:

\lambda = 420 nm

Explanation:

As we know that position of maximum on the screen in diffraction pattern is given as

y = (\frac{2N + 1}{2})\frac{\lambda L}{d}

here we know that

position of third maximum due to red color light and position of fifth maximum of unknown wavelength are same

so we have

\frac{7 \lambda_r L}{2d} = \frac{11 \lambda L}{2d}

so we have

\lambda = \frac{7}{11} \lambda_r

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7 0
4 years ago
I need help with 1 -7 please .
strojnjashka [21]

Answer:

need i help with 1-7 please

8 0
3 years ago
Write about any 8 areas of field where physics is applied. illustrate with examples.
Ulleksa [173]

1. In construction. When constructing roads, building

2. In Engineering, when engineering we use physics such as calculations.

3. At home

4. In industries, industries use chemicals and so on.

5. In tailoring, we use the knowledge of physics like when sowing.

6. In carpentry, we use calculations.

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4 0
3 years ago
if a 0.040-kg stone is whirled horizontally on the end of a 60-m string at a speed of 4.4 m/s, what is the centripetal force ? *
SSSSS [86.1K]

Answer:

0.013N

Explanation:

F=\frac{mv^{2} }{r}

m=0.04, v=4.4m/s, r=60

F=0.013 N

4 0
3 years ago
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