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4 years ago

How much work is done when a 214 newton force pushes a sleeping cow 37m across a field.

1 answer:

8 0

Hello!

Answer:
7918 J

Explanation:

We are assuming that the floor (field) is completely horizontal since there's no information about that in the statement.

We are going to use the following formula:

$W= F . Cos \alpha . D$

Where:

$F=214 N$
$\alpha =0$ º
$D= 37m$

Then, by substituting we have:

$W=214N . Cos (0).37m= 7918 N.m=7918 J$

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Draw the position vs. time graph for a person walking at a constant speed of 1m/s for 10 seconds. On the same axes, draw graph f

Leto [7]

In both scenarios, the position - time graph will be a linear graph, since the speed is constant, so your position is moving at a consistent pace.

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3 years ago

A child is playing on a swing. As long as he does not swing too high the time it takes him to complete one full oscillation will

Aleks [24]

Answer:

We know that for a pendulum of length L, the period (time for a complete swing) is defined as:

T = 2*pi*√(L/g)

where:

pi = 3.14

L = length of the pendulum

g = gravitational acceleration = 9.8 m/s^2

Now, we can think on the swing as a pendulum, where the child is the mass of the pendulum.

Then the period is independent of:

The mass of the child

The initial angle

Where the restriction of not swing to high is because this model works for small angles, and when the swing is to high the problem becomes more complex.

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3 years ago

The ______ length of a lens is the distance from the center of the lens to<br> its principal focus.

Marizza181 [45]

Answer:

<h2>Focal length</h2>

Explanation:

The Focal length of a lens is the distance from the center of the lens to

its principal focus.

3 0

3 years ago

¿Juan quiere calentar una barra de aluminio de 100 g, para realizar un trabajo. La temperatura ambiente es de 27°C pero necesita

Luda [366]

Answer:

Explanation:

masa m de la barra de aluminio = 100 g

temperatura ambiente = 27 ° C

<em>Asumiremos que la barra de aluminio está en equilibrio térmico con el ambiente. </em>

Esto significa que la temperatura inicial de la barra es de 27 ° C

temperatura final a la que la barra debe calentarse = 60 ° C

el aumento de temperatura ΔT será

ΔT = 60 ° C - 27 ° C = 33 ° C

capacidad calorífica específica c del aluminio = 0.215 cal/g°C

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3 years ago

A narrow wire is used to slow the flow of the electrons in a circuit

vladimir2022 [97]

That's true.

In fact, the resistance of a wire is given by:
$R= \frac{\rho L}{A}$
where
$\rho$ is the resistivity of the material
L is the length of the wire
A is the cross-sectional area of the wire

We see that the resistance of the wire is inversely proportional to the cross-sectional area: A. Therefore, the narrower the wire, the smaller A, the larger the resistance. But higher resistance means that the current flowing through the wire is lower, therefore the flow of electrons in the circuit is slower, and the initial sentence is true.

3 0

3 years ago