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3 years ago

Which of the following is contained in a pull start lawnmower?

Physics

2 answers:

Nonamiya [84]3 years ago

8 0

Answer:

The correct answer is a pulley and a wheel and axle.

Explanation:

Pull start lawnmowers usually have a traction mechanism designed to turn on the axle of the crankshaft and start the lawnmower engine. Also known as a recoil starter, the traction mechanism consists of a few different parts that work together to allow the user to start the mower engine.

The casing contains the pulley, starter cord, and rewind spring, all of which work together to form the mower's traction mechanism.

The wheels allow the machine to be moved on the ground.

Have a nice day!

Ksivusya [100]3 years ago

6 0

A wheel and axle and an inclined plane.

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A(n) 0.576 kg soccer ball approaches a player horizontally with a speed of 20.9 m/s. The player illegally strikes the ball with

Travka [436]

Answer:

17.6kg.m/s in the opposite direction of the initial velocity.

Explanation:

In order to solve this we can use the Impulse-Momentum theorem:

$J=\Delta p\\J=m(v_f-v_o)$

We will assume the motion of the ball approaching the player as positive, so:

$J=0.576kg((-9.73m/s)-20.9m/s)=-17.6kg.m/s$

So the impulse is 17.6kg.m/s in the opposite direction of the initial velocity.

4 0

3 years ago

Krista is playing tennis at the park. When the tennis ball flies toward her, Krista hits the ball with her racket, which causes

xenn [34]

Answer:

B. When the racket hits the tennis ball with a force, the tennis ball applies an equal but opposite force to the racket.

Explanation:

According to the Newton's third law of motion every action has equal and opposite reaction. So, when the force is applied by the racket on the ball then the ball also applies an equal intensity of force in the opposite direction on the racket. It is just that the the force on the racket is absorbed by the player holding it.

7 0

3 years ago

A sledgehammer strikes an anvil with a velocity of 50 ft/sec (Fig. 2.59). The hammer and the anvil weigh 12 lb and 100 lb, respe

saveliy_v [14]

Hard question thx for the points give me brainlest points plz

4 0

3 years ago

A man walks along a straight path at a speed of 4 ft/s. A searchlight is located on the ground 6 ft from the path and is kept fo

BARSIC [14]

We are given that,

$\frac{dx}{dt} = 4ft/s$

We need to find $\frac{d\theta}{dt}$ when $x=8ft$

The equation that relates x and $\theta$ can be written as,

$\frac{x}{6} tan\theta$

$x = 6tan\theta$

Differentiating each side with respect to t, we get,

$\frac{dx}{dt} = \frac{dx}{d\theta} \cdot \frac{d\theta}{dt}$

$\frac{dx}{dt} = (6sec^2\theta)\cdot \frac{d\theta}{dt}$

$\frac{d\theta}{dt} = \frac{1}{6sec^2\theta} \cdot \frac{dx}{dt}$

Replacing the value of the velocity

$\frac{d\theta}{dt} = \frac{1}{6} cos^2\theta (4)^2$

$\frac{d\theta}{dt} = \frac{8}{3} cos^2\theta$

The value of $cos \theta$ could be found if we know the length of the beam. With this value the equation can be approximated to the relationship between the sides of the triangle that is being formed in order to obtain the numerical value. If this relation is known for the value of x = 6ft, the mathematical relation is obtained. I will add a numerical example (although the answer would end in the previous point) If the length of the beam was 10, then we would have to

$cos\theta = \frac{6}{10}$

$\frac{d\theta}{dt} = \frac{8}{3} (\frac{6}{10})^2$

$\frac{d\theta}{dt} = \frac{24}{25}$

Search light is rotating at a rate of 0.96rad/s

4 0

3 years ago

Which of the following is a good scientific question? A. Are dragons lizards or birds? B. How do star fish fall in love? C. Does

Wittaler [7]

<span>C. Does eating less fat increase a mouse's lifespan?
(If a mouse eats less fat in its meals then will it live longer: compared to other mice lives.

</span>This is a testable question that can be answered by designing and conducting an experiment.

I think D could be correct as well.

My final answer is D.

6 0

3 years ago

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