All categories

3 years ago

9 The friction between the car and the mud is equivalent to the__________________.

1 answer:

5 0

Answer: e. None

Explanation: when the car goes into the muddy area, then the friction force on the tire is too small so the wheels are turned and slipped. Friction in this case is beneficial

You might be interested in

A 40-cmcm-long tube has a 40-cmcm-long insert that can be pulled in and out. A vibrating tuning fork is held next to the tube. A

Licemer1 [7]

Answer:

1070 Hz

Explanation:

First, I should point out there might be a typo in the question or the question has inconsistent values. If the tube is 40 cm long, standing waves cannot be produced at 42.5 cm and 58.5 cm lengths. I assume the length is more than the value in the question then. Under this assumption, we proceed as below:

The insert in the tube creates a closed pipe with one end open and the other closed. For a closed pipe, the difference between successive resonances is a half wavelength $\frac{\lambda}{2}$ .

Hence, we have

$\dfrac{\lambda}{2}=58.5-42.5=16 \text{ cm}$

$\lambda=32\text{ cm}=0.32 \text{ m}$ .

The speed of a wave is the product of its wavelength and its frequency.

$v=f\lambda$

$f=\dfrac{v}{\lambda}$

$f=\dfrac{343}{0.32}=1070 \text{ Hz}$

7 0

4 years ago

Which is a way that biotechnology has not helped society

nata0808 [166]

I would select answer C

6 0

3 years ago

A steel wire in a piano has a length of 0.680 m and a mass of 4.600 ✕ 10⁻³ kg. To what tension must this wire be stretched so th

garik1379 [7]

Answer:

728 N

Explanation:

$L$ = length of the wire = 0.680 m

$m$ = mass of the steel wire = 0.0046 kg

$f$ = Fundamental frequency = 261.6 Hz

$T$ = tension force in the steel wire

Fundamental frequency in wire is given as

$f = \frac{1}{2L} \sqrt{\frac{TL}{m} } \\261.6 = \frac{1}{2(0.680)} \sqrt{\frac{T(0.80)}{0.0046} }\\(2) (0.680) (261.6) = \sqrt{\frac{T(0.80)}{0.0046} }\\355.8 = \sqrt{\frac{T(0.80)}{0.0046} }\\355.8^{2} = \frac{T(0.80)}{0.0046}\\T = \frac{(355.8^{2}(0.0046))}{0.80} \\T = 728 N$

3 0

3 years ago

The world will face energy crisis in near future justify this statement

jeka57 [31]

Answer:

Nowadays most of our works are being done through different types of energy which are non-renewable. People are wasting lot of energy (hydel, dolar etc.) due to which in future we can face energy crisis.

5 0

3 years ago

A battery supplies 0.75 A to three resistors connected in parallel. The current through the first resistor is 0.24 A and the cur

Anastasy [175]

Total current flow in circuit=0.75
Current flow through third resistor=0.75-(0.24+0.22)
=0.29

7 0

3 years ago