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3 years ago

14

A person pushes a 50kg box to the right with 100N of force at a constant velocity of 5m/s. Calculate the coefficient of friction

between the box and the surface.

1 answer:

Anna11 [10]3 years ago

8 0

The weight of the box is 50x9.8 = 490 N. The force of friction is 100N. F= μΝ so coefficient = 100/490 = 0.20

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Shortly after the Earth first formed, intense heat built up and large portions of the planet became molten. What happened to the

Drupady [299]

The Earth cooled down, forming water on vast lands while leaving others dry. oxygen and carbon from volcanoes helped create plant life under water, away from the sun's harmful UV rays. Eventually, the plants created enough oxygen to create an ozone layer around earth, making our planet sustainable for life, thus, creating life or as we can call it, one celled organisms. These cells would eventually evolve into bigger life forms, like the dinosaurs.

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3 years ago

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A jumbo jet of mass 100,000 kg during takeoff experience a thrust for each of its four engines of 50,000 N. producing an acceler

PtichkaEL [24]

Answer:

F=MA

5OOOO=100000×A

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4 years ago

An object moves with a positive acceleration. Could the object be moving with increasing speed, decreasing speed or constant spe

Masja [62]

Answer:

Increasing speed.

Explanation:

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.

Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.

Mathematically, acceleration is given by the equation;

$Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}$

In this scenario, an object moves with a positive acceleration. Thus, the object is moving with an increasing speed and as such it has acceleration in the same direction as its velocity with respect to time.

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3 years ago

Answer<br> It's too short. Write at least 20 characters to get a great answer.

Roman55 [17]

Answer: I think the first option is the best option because water isn't a heat conductor and all the other options are not very accurate.

Explanation:

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3 years ago

An air conditioner runs 15 minutes each hour on a hot summer day. It is on a 240 volt circuit and uses 21 amps. Rate is $.10/kWh

Helen [10]

Answer:

Approximately $\$ 3.02$ .

Explanation:

Note that the electric rate in this question is in the unit dollar-per- ${\rm kWh}$ , where $1\; {\rm kWh}$ is the energy to run an appliance of power $1\; {\rm kW}$ for an hour.

Number of minutes for which the air conditioner is running in that day: $15 \times 24 = 360\; \text{minute}$ . Apply unit conversion and ensure that this time is measured in hours (same as the unit of the electric rate.)

$\begin{aligned} \text{time} &= 360\; \text{minute} \times \frac{1\; \text{hour}}{60\; \text{minute}} = 6\; \text{hour} \end{aligned}$ .

The power of this air conditioner is:

$\begin{aligned} \text{power} &= \text{voltage} \times \text{current} \\ &= 240\; {\rm V} \times 21\; {\rm A} \\ &= 5040\; {\rm W} \\ &= 5.04\; {\rm kW} \end{aligned}$ .

Thus, the energy that this air conditioner would consume would be:

$\begin{aligned}\text{energy} &= \text{power} \times \text{time} \\ &= 5.04\; {\rm kW} \times 6\; \text{hour} \\ &= 30.24\; {\rm kWh} \end{aligned}$ .

At a rate of $0.1$ dollar-per- ${\rm kWh}$ , the cost of that much energy would be approximately $3.02$ dollars (rounded to the nearest cent.)

6 0

2 years ago