true or false: if the net force on an object is zero, the torque on the object will be zero. explain.

The maximum height reached by the brick above the ground is 20 ft. The time taken by the brick to reach the ground is 0 seconds. Free-fall motion (uniformly accelerated motion) after falling from a height of 20 feet. Further, the acceleration experienced by the free brick is equal to the acceleration due to gravity which is approximately 32ft/sec², downward.

Hence, we can write its acceleration as, a = g = 32ft/sec².

Here, u = 0 as the brick was not moving initially while it was at rest on the top of the load of bricks.

Now, the value of v(t) can be obtained by integrating the above expression w.r.t. time as shown below:v(t) = u + a.t = 0 + 32t = 32t ...(1)

The value of x(t) can be obtained by integrating the expression for v(t) w.r.t. time, i.e. t as shown below :x(t) = (1/2).a.t² + u.t + x₀ = (1/2).32t² + 0 + 20ft = 16t² + 20ft ...(2)

Here, x₀ = 20ft is the initial displacement of the brick above the ground.

Now, we can answer the questions as follows:

(a) Using  the following relation: v = u + a.t = 0 when the brick is at its highest point.

Hence, the time taken to reach this point can be obtained as follows:0 = u + a.t ⇒ t = (-u/a) = (0/32) sec = 0 secThis means that the brick reaches its maximum height at t = 0 sec, which is the initial moment.

Thus, the maximum height reached by the brick above the ground is, x(0) = 16.0² + 20 = 20 ft

(b) The time taken by the brick to reach the ground can be obtained by using the following relation: x(t) = 0.

Here, we are interested in finding the value of t.

Hence, we can substitute x(t) from equation (2) above and equate it to 0 to obtain the value of t as shown below:16t² + 20 = 0 ⇒ t² = -(20/16) sec².

This means that the brick doesn't take any finite time to reach the ground from its maximum height.

This is because it falls vertically downwards from a height of 20 ft under the action of gravity.

Thus, it reaches the ground at t = 0 sec only.

(c) The speed of the brick just before it hits the ground can be obtained by using the expression for v(t) from equation (1) above and substituting t = 0 sec (just before it hits the ground) as shown below:

v(0) = 32(0) = 0 ft/sec.

Hence, the speed of the brick just before it hits the ground is 0 ft/sec.

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Answer:

The relationship of the speed of sound, its frequency, and wavelength is the same as for all waves: vw = fλ, where vw is the speed of sound, f is its frequency, and λ is its wavelength. ... The frequency is the same as that of the source and is the number of waves that pass a point per unit time.

Explanation:

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The angular velocity of gear B after A undergoes an angular displacement of 10 revolutions, measured counterclockwise, is 11.2 rad/s (counterclockwise) to three significant figures.

Angular displacement is a measure of the change in the position of an object that is rotating about a fixed axis. It is the angle through which an object has rotated, measured in radians or degrees, and is defined as the final angular position minus the initial angular position. Angular displacement can be positive or negative, depending on the direction of rotation, and is usually measured in radians.

First, let's convert the angular displacement of 10 revolutions to radians:

10 rev * 2π rad/rev = 20π rad

Next, we can use the following kinematic equation to solve for the final angular velocity of gear A:

ωf^2 = ωi^2 + 2αΔθ

where ωi is the initial angular velocity of gear A, α is the angular acceleration of gear A, and Δθ is the angular displacement of gear A.

Substituting the given values:

ωf^2 = (11 rad/s)^2 + 2(2 + (0.006 rad/s^2)^2)(20π rad)

ωf^2 = 121 + 0.072416(20π)

ωf^2 = 121 + 4.5513

ωf^2 = 125.5513

ωf = 11.214 rad/s

Now we can use the gear ratio to find the angular velocity of gear B. Let's assume that gear A and gear B have the same number of teeth, so the gear ratio is 1:1. The angular velocity of gear B is equal to the angular velocity of gear A:

ωB = ωf = 11.214 rad/s

Therefore, Gear B's angular velocity, measured anticlockwise after gear A has undergone an angular displacement of 10 revolutions, is 11.2 rad/s (anticlockwise), to three significant numbers.

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The primary difference between science and technology is Science is concerned with gaining knowledge, while technology is concerned with usefully applying knowledge.

Science is the knowledge about the natural world that is based on facts learned through experiments and observation.

Technology is the application of scientific knowledge to the practical aims of human life or, as it is sometimes phrased, to the change and manipulation of the human environment.

The basic difference between science and technology is;

Science explores new knowledge methodically through observation and experimentation while Technology is the application of scientific knowledge for various purposes.

Thus, the primary difference between science and technology is Science is concerned with gaining knowledge, while technology is concerned with usefully applying knowledge.

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m•g = 0.250 kg • 9.8 m/s/s = 2.45 N is the gravitational force acting downward. The acceleration is equal to 2.45 N net force divided by mass.

According to the formulae a = v/t, accelerating (a) appears to be the result of changes in time and velocity (v) (t).

The rate of increase in speed is referred to as acceleration. The majority of the time, although not always, acceleration indicates a change in speed. Even though the object is moving in a circular motion, its velocity direction is changing, which causes it to continue to accelerate.

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The correct statement regarding potential energy is that "potential energy is the energy that an object has based on its position."

This means that an object has the potential to do work based on its position in relation to other objects or forces. For example, a ball at the top of a hill has potential energy due to its position at the top of the hill, and this potential energy can be converted into kinetic energy as the ball rolls down the hill.

The other statements about potential energy are not true.

Potential energy can be stored and is not immediately converted to kinetic energy.

The potential energy of an object can be determined using the formula PE = mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height of the object.

And finally, an object in motion can still have potential energy, such as a pendulum swinging back and forth.

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Answer:

Technician B only is correct

Explanation:

The gear ratio is the ratio of the output speed to the input speed such that an overdrive gear ratio of more than 1:1, having more speed per speed of engine rotation RPM

Overdrive ratios conditions is one where the vehicle wheels and speed is faster at a given engine rotation, such that there is fuel efficiency is increased as the engine rotation is low for a given speed and distance of travel.

Answer:

its a pie chart

Explanation:

.........................

Answer:

its a pie chart?

Explanation:

.......

Answer:

2

Explanation:

1+x/4+x = 1/2

4+x = 2 + 2x

x = 2

Answer:

ok

Explanation:

Answer:

nuclear fusion plants are fossil fuels, if you are asking which of the following is a fossil fuel

Explanation:

The resistor of the electric lamp is marked at 240 volts and 60 watts is 960 ohms. Thus, option D is correct.

The resistance is a property that gives obstruction the current flow.  It blocks the current flow in the circuit. The unit of resistance is the ohm.    

From the given,

The voltage of the electric lamp (E) = 240 volt

Power in the circuit (P) = 60 watt

Resistance =?

Power (P) = E² / R

R = E²/P

   = 240×240/60

  = 960 Ω

The resistance of the electric lamp with a given voltage and power is 960 Ω. Thus, the ideal solution is D.

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The definition of eccentricity allows us to find that the answer for the distance to the focus is

             c = 4.6 10⁶ km

The orbit of the plants without ellipses, where the eccentricity is the ratio between the distance to the focus and the major axis  

                e = \(\frac{c}{a}\)

Where e is the eccentricity, c the distance to the focus and a the major axis

In this case they indicate the value of the eccentricity e = 0.92 and the value of the major axis a = 5 10⁶ km

              c = e a

Let's calculate

              c = 0.92 5 10⁶

              c = 4.6 10⁶ km

In conclusion using the definition of eccentricity we can calculate the distance to the focus is

             c = 4.6 10⁶ km

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Answer:

4,600,000 km

Explanation:

The impulse-momentum theorem can be utilized: Change in momentum is an impulse. The impulse is known to be 0.05 Ns (1008+10011). Therefore, the force exerted by each player is equal to 1008+10011 N divided by 0.05.

According to the impulse-momentum theorem, the change in an object's momentum will be proportional to the impulse applied to it. Now that we understand the impulse-momentum theorem, we can see that the same velocity change can be caused by applying a small net force for a long time and a large net force for a short time.

p equals F net t. The impulse-momentum theorem is derived from the equation F net t, which is also referred to as impulse.

The use of airbags in automobiles is one example. Because they can reduce the force exerted on an object involved in a collision, airbags are used in automobiles. By extending the amount of time required to stop the driver and passenger's momentum, airbags accomplish this.

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Answer:

because the knife is sharp

Answer:

Pressure is inversely proportional to the area of the surface. While a blunt knife has more area coming in contact than a sharp knife and the pressure exerted by the blunt knife will be less as compared to that of a sharp knife. Therefore it is easier to cut with a sharp knife.

Explanation:

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Answer:

30 m\ s Ans .....

Explanation:

Data:

f = 10 Hz

w = 3 m

v = ?

Formula:

v = fw

Solution:

v = ( 10)(3)

v = 30 m\ s Ans ........

Answer:

0,6

Explanation:

from the picture there are 10 dots. It means that the time needed to make these dot is

10/50 * 1 sec = 0.2 sec

the length (or we can say distance) of 10 dots are 12 cm. we must convert to meter so it become 0.12 m

v = d/t = 0.12/0.2 = 0.6 m/s

The energy of the high energy neutron is 940.51 MeV.

Speed is nothing but the distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity with the SI unit meter/second.

We know that mass of the neutron m₀ = 939.6 MeV/c²

A high energy neutron is travelling at a speed of 18 million m/s.

Given that, v = 1.8 * 10⁷ m/s

The energy of neutron is calculated with the formula, m₀* c²/√(1 - v²/c²)

⇒ 939.6 * (3* 10⁸)²/√[1 - (1.8 * 10⁷)²/(3* 10⁸)²]

⇒ 940.51 MeV

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The required mass of the object when net force on it, distance moved and final velocity are given is calculated to be 4 kg.

The net force on the unknown mass object is 20 N.

Distance travelled is 10 m.

Final velocity is 10 m/s.

The object starts from rest, so u = 0.

Mass of the object is to be calculated.

The force is given by the expression, F = m a

Making 'm' as subject, we have,

m = F/a ---(1)

Acceleration can be found using the expression, v² - u² = 2 a s ---(2)

a = (v² - u²)/2 s = (10² - 0)/(2×10) = 100/20 = 5 m/s²

Using it in (1),

m = F/a = 20/5 = 4 kg

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Answer:

h = 35857 km

Explanation:

A geosynchronous orbit can be defined as circular orbit which lies on the Earth's equatorial plane and follows the direction of the Earth's rotation in a period that's equal to the Earth's rotational period and thereby appearing motionless, at a fixed position in the sky relative to the ground observers.

We are given;

Radius of earth(R) = 6.37 x 10^(6) m

Mass of earth (Me) = 5.97 x 10^(24) kg

Gravitational constant = 6.67 × 10^(-11) m³/kg.s²

The earth has a rotational period of 24 hours per day. This gives in seconds

T = 24 × 60 × 60

T = 86400 s

Let's make the height of the orbit from Earth's surface to be h

Also, let ω be the uniform angular velocity in rad/s with which the satellite rotates in the geosynchronous orbit

Now, equating the centripetal force with the gravitational force gives us;

mω²(R + h) = G•Me•m/(R + h)²

m will cancel out. Also ω can be written as 2π/T

Thus,we now have;

(R + h) = ∛(G•Me•T²/(4π²))

Plugging in the relevant values, we have;

(R + h) = ∛(6.67 × 10^(-11) × 5.97 x 10^(24) × 86400²/(4π²))

(R + h) = 42227 Km

Since R = 6.37 x 10^(6)m = 6370 km

Thus;. h = 42227 - 6370 = 35857 km

The combination of the compound microscopes and refracting telescopes, operate by magnifying the image.

High levels of magnification are produced by the objective lens and eyepiece lens working together. Multiplying the objective lens' and the eyepiece lens' individual magnifications yields the microscope's overall magnification.

In a refracting telescope, the objective lens and eyepiece lens work together to produce high magnification, which makes distant objects look larger and more distinct to the spectator.

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We would see the frisbee fly by us at a speed of 40 m/s to the right.

Speed of frisbee relative to the ground = Speed of car - Speed of frisbee relative to car

Speed of frisbee relative to the ground = 50 m/s - 10 m/s

Speed of frisbee relative to the ground = 40 m/s

Therefore, we would see the frisbee fly by us at a speed of 40 m/s to the right.

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Answer:

true

Explanation:

place hand under base and one on the arm/handle

Answer:

Higher force would be required to stop 5 kg of ball

Explanation:

The force required to stop a moving object depends on its momentum.

The momentum for 8 kg of rolling ball is = 8 kg * 0.2 m/s = 1.6 kgm/s

The momentum for 5 kg of rolling ball is = 8 kg * 1.0 m/s = 5 kgm/s

Hence, momentum of 5 Kg ball is higher than the momentum of 8 Kg of ball

Hence, higher force would be required to stop 5 kg of ball

Answer:

0

Explanation:

The dancer starts and ends at the same place

Answer:

Explanation:

2×10-¹² = (5-³*5-³* 3.14)*h

h=0.00000001 m

The combination of high elevation and high latitude generally results in the coldest temperatures.

option D.

Elevation refers to the height of a location above sea level, and latitude refers to the distance of a location from the equator. In general, higher elevations are colder due to the decrease in atmospheric pressure, which leads to lower temperatures. Similarly, higher latitudes are colder because they receive less direct sunlight and are farther away from the equator.

When both high elevation and high latitude are combined, the temperature tends to be the coldest. This is because high elevation areas are often located at higher latitudes, such as in mountainous regions near the poles, where the combination of lower temperatures due to elevation and lower temperatures due to latitude results in even colder temperatures.

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Answer:

D is the correct answer

Answer: Microtrauma stimulates muscle growth!

Explanation - I hope that helped!