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leonid [27]
2 years ago
14

3. A 20 kg lawnmower is pushed by its handle, which makes a 40 degree angle with the horizontal. What

Physics
1 answer:
Mkey [24]2 years ago
5 0

<u>13788 J is required to finish the work.</u>

Explanation:

Given that,  

Mass of lawnmower is 20 kg  

Force = 30 N

\text { Angle }(\theta)=40^{\circ}

Displacement ( distance moved )= 20m

The force of 30N is applied along the direction of motion and was applied for the whole 20 m.

The formula of work done for one pass is

\text { Work done }=\text { force } \times \text { displacement } \times \cos \theta

Substituting the given data into the formula,

W=30 \times 20 \times \cos 40^{\circ}

\mathrm{W}=600 \times \cos 40^{\circ}

\mathrm{W}=600 \times 0.766

W = 459.6 J

Work done for one pass = 459.6J

Now, work done for 30 passes is calculated by multiplying the work done for one pass into 30.

\text { Then the work done for } 30 \text { passes is } 459.61 \times 30=13788 \mathrm{J}

Work is done by the person pushing the mower to finish the work is <u>13788 J</u>.

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Answer:

The tension in string is found to be 188.06 N

Explanation:

For the vibrating string the fundamental frequency is given as:

f1 = v/2L

where,

f1 = fundamental frequency = 335 Hz

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L = length of string = 28.5 cm = 0.285 m

Therefore,

v = f1 2L

v = (335 Hz)(2)(0.285)

v = 190.95 m/s

Now, for the tension:

v = √T/μ

v² = T/μ

T = v² μ

where,

T = Tension

v = speed = 190.95 m/s

μ = linear mass density of string = mass/L = 0.00147 kg/0.285 m = 5.15 x 10^-3 kg/m

Therefore,

T = (190.95 m/s)²(5.15 x 10^-3 kg/m)

<u>T = 188.06 N</u>

4 0
2 years ago
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Answer:

Millions of years.

Explanation:

Fossil fuels are fuels formed by natural processes. It involves decomposition of dead and decaying animals, marine and plants for over million years. This some times take more than hundred million years to convert into fuel. This is why they are called non renewable resources of energy. The decomposition of dead plant species forms coal and decomposition animals of land and sea forms crude oil and gas.

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A cyclotron designed to accelerate protons has a magnetic field of magnitude 0.15 T over a region of radius 7.4 m. The charge on
klio [65]

Explanation:

It is given that,

Magnetic field, B = 0.15 T

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The cyclotron frequency is given by :

f=\dfrac{qB}{2\pi m}

f=\dfrac{1.60218\times 10^{-19}\ C\times 0.15\ T}{2\pi \times 1.67262 \times 10^{-27}\ kg}

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\omega=14368296.44\ rad/s

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8 0
2 years ago
Which statement about the horizontal distance covered by a projectile launched at an angle less than 90° is true?
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<h2>Answer: A</h2>

Explanation because the distance covered is equal time intervals is the same or equal.

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Which of the following properties of light can only be explained by wave theory and not by the Photoelectric effect? reflection
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