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2 years ago

A 1,300 kg wrecking ball hits the building at 1.07 m/s2.

Physics

2 answers:

dezoksy [38]2 years ago

7 0

So we know F=ma
m means mass and a means acceleration
so Force= ma
so F=1300X1.07=1391N
hope you like it
if it helps you please mark the answer as brainliest answer

tatuchka [14]2 years ago

6 0

F (force) = mass × acceleration.

The unit N (Newton) is known as kilogram-meter/seconds2.

Thus, F = 1300 kg × 1.07 m/s2 = 1391 N.

The answer is 1391 N.

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A small cylinder rests on a circular turntable that is rotating clockwise at a constant speed. Which set of vectors gives the di

I am Lyosha [343]

The question is missing the diagram. Also, the choices must have pictorial representation. So, I have attached the missing diagram and the pictorial representation of the vectors.

Answer:

The correct representation is attached below. Force and acceleration will be towards the center of rotation while the velocity will be along the tangent to the circular motion. Option (D).

Explanation:

From the figure, we can conclude the following points:

1. The cylinder is under a uniform circular motion as the circular table is moving at constant speed.

2. For a circular motion, velocity acts along the tangent to the circular path.

3. For a circular motion, centripetal force acts on the body that causes it move around a circular path.

4 The direction of the centripetal force is radially inward towards the center of rotation.

5. The centripetal force causes a centripetal acceleration acting on the body.

6. From Newton's second law, the net acceleration of a body is in the same direction as that of the net force acting on it. So, centripetal acceleration also acts in the radially inward direction.

Therefore, from the above conclusions, it is clear that velocity will act in the horizontal direction at the given instance of time and force and acceleration will act vertically down for the given instance.

This is shown in the picture below. The option (D).

4 0

2 years ago

Describe where microwaves are found on the EMS compared to the other six forms of radiation. In your description, compare and co

Setler [38]

Answer:

Explanation:

The electromagnetic spectrum is the range of all types of radiation. Radiation is energy that travels and spreads out as it goes – the visible light that comes from a lamp in your house and the radio waves that come from a radio station are two types of electromagnetic radiation. The other types of EM radiation that make up the electromagnetic spectrum are microwaves, infrared light, ultraviolet light, X-rays and gamma-rays.

To help you, check out the picture!

3 0

1 year ago

You have found a treasure map that directs you to start at a hollow tree, walk 300 meters directly north, turn and walk 500 mete

Dmitry_Shevchenko [17]

Answer:633 m

Explanation:

First we have moved 300 m in North

let say it as point a and its vector is $300\hat{j}$

after that we have moved 500 m northeast

let say it as point b

therefore position of b with respect to a is

r $_{ba}=500cos(45)\hat{i}+500sin(45)\hat{j}$

Therefore position of b w.r.t to origin is

$r_b=r_a+r_{ba}$

$r_b=300\hat{j}+500cos(45)\hat{i}+500sin(45)\hat{j}$

$r_b=500cos(45)\hat{i}+\left [ 250\sqrt{2}+300\right ]\hat{j}$

after this we moved 400 m $60^{\circ}$ south of east i.e. $60^{\circ}$ below from positive x axis

let say it as c

$r_{cb}=400cos(60)\hat{i}-400sin(60)\hat{j}$

$r_c=r_{b}+r_{cb}$

$r_c=500cos(45)\hat{i}+\left [ 250\sqrt{2}+300\right ]\hat{j}+400cos(60)\hat{i}-400sin(60)\hat{j}$

$r_c=\left [ 250\sqrt{2}+200\right ]\hat{i}+\left [ 250\sqrt{2}+300-200\sqrt{3}\right ]\hat{j}$

magnitude is $\sqrt{\left [ 250\sqrt{2}+200\right ]^2+\left [ 250\sqrt{2}+300-200\sqrt{3}\right ]^2}$

=633.052

for direction $tan\theta =\frac{250\sqrt{2}+300-200\sqrt{3}}{250\sqrt{2}+200}$

$tan\theta =\frac{307.139}{553.553}$

$\theta =29.021^{\circ}$ with x -axis

7 0

2 years ago

An electric heater containing two heating wires X and Y is connected to a power supply of electromotive force(emf) 9.0V and negl

mina [271]

Answer:

0.4 ohms.

Explanation:

From the circuit,

The voltage reading in the voltmeter = voltage drop across each of the parallel resistance.

1/R' = 1/R1+1/R2

R' = (R1×R2)/(R1+R2)

R' = (2.4×1.2)/(2.4+1.2)

R' = 2.88/3.6

R' = 0.8 ohms.

Hence the current flowing through the circuit is

I = V'/R'................ Equation 1

Where V' = voltmeter reading

I = 6/0.8

I = 7.5 A

This is the same current that flows through the variable resistor.

Voltage drop across the variable resistor = 9-6 = 3 V

Therefore, the resistance of the variable resistor = 3/7.5

Resistance = 0.4 ohms.

7 0

2 years ago

How much energy does it take to melt a 16.87 g ice cube? ΔHfus = 6.02 kJ/mol How much energy does it take to melt a 16.87 g ice

Vilka [71]

Answer:

How much energy does it take to melt a 16.87 g ice cube? ΔHfus = 6.02 kJ/mol How much energy does it take to melt a 16.87 g ice cube? = 6.02 kJ/mol

A. 108 kJ

B. 102 kJ

C. 5.64 kJ

D. 936 kJ

E. none of the above

5.64 kJ

Explanation:

The Heat of fusion is the heat energy required to dissolve a given mass of ice at melting point.

<h3>Step by Step Calculation</h3>

The heat energy required to dissolve ice can be calculated using the expression below;

Q = ΔH $_{f}$ x m ...............................................1

where Q is the heat energy required;

ΔH $_{f}$ is the heat of fusion for ice;

m is the mole

All the parameters above are provided in the question except m, so to get m we use the molar mass of water (also for ice) which is 18.01528 g/mol .

This means that 18.01528 g of ice is contained in one mole, therefore the mole for 16.87 g of ice is given as;

$m = \frac{16.87g}{18.015g/mol}$

m = 0.9364 mole of ices

Now the parameters are complete, we are given;

ΔH $_{f}$ = 6.02 kJ/mol

m = 0.9364 mol

Q =?

Substituting into equation 1, we have

Q = 6.02 kJ/mol x 0.9364 mol

Q = 5.64 kJ

Therefore, the energy required to melt 16.87 g of ice is 5.64 kJ

5 0

2 years ago