PHYSICS MIDDLE SCHOOL

A truck of mass 1800kg is moving with a speed 54km/h. When brakes are applied, it stops with uniform negative acceleration at a distance of 200m. Calculate the force
applied by the brakes of the truck and the work done before stopping.

Answers

Answer 1
Answer:

Force = 3200 N

Work done = 640, 000 Nm

Explanation:

We begin by calculating the deceleration of the truck, using the velocity and distance;

a = (v² – u²)/2s

whereby;

a = acceleration

v = initial velocity

u = initial velocity

s = distance

We begin by changing the speed from km/h into m/s;

54km/hr = 15m/s

Then acceleration;

a = (0² – 15²) / 2 * 200

a = -225 / 400

a = - 0.5625 m/ s²

To calculate force;

F = ma

Whereby;

F = force

M = mass (in kgs)

a = acceleration

F = 1800 / 0.5625

F = 3200 N

Work done = Force * displacement

Work done = 3200 * 200

= 640, 000 Nm

Learn More:

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The velocity of sound in air at stp (standard temperature and pressure) is approximately 344 m/s. if the frequency of the sound wave is = 4.8 khz, what is the wavelength in cm?

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COLLEGE

Katrina is a teen from Australia who participates in curling, a sport in which players slide stones across the ice toward a target. Katrina learned about the popular Canadian sport by watching the Olympics. What helped Katrina learn about curling? 1.leadership 2.globalization
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Answers

Answer:

1.5 g/cm^3

Explanation:

In the question i am assuming that wooden block of weight W floats with exactly one-half of its volume below the waterline.

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MIDDLE SCHOOL

A molecule contains 16 atoms and undergoes a chemical change. How does the chemical change affect the total number of atoms of each element? It changes to zero. It decreases. It remains the same. It increases.

Answers

The total number of atoms of each element remains the same when a molecule contains 16 atoms and undergoes a chemical change.

What is  chemical reaction?

One or more chemicals, known as reactants, are changed into one or more new substances, known as products, during a chemical reaction. Chemical elements or chemical compounds make up substances. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products.

Chemical reactions are a fundamental component of life itself, as well as technology and culture. Burning fuels, smelting iron, creating glass and pottery, brewing beer, making wine, and making cheese are just a few examples of ancient processes that involved chemical reactions.

In chemical reaction total number of atoms remains conserved. Hence, the total number of atoms of each element remains the same in this case.

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Explanation:

Took the test :3

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