A rocket has a mass of 142 kg. If you want to give it an acceleration of 7 m/s2 how much force does the engine need to apply

Answer:  D) 0-3 seconds

Explanation:

The limiting frictional force is 50 N.

Frictional force is the force that opposes motion. The frictional force acts in a direction that is opposite to the force moving the body forward.

The weight of the object is given by;

W = mg

W = 10 Kg × 10 ms-2 = 100 N

Now;

Recall that;

μ = F/R

μ = coefficient of friction

F = limiting frictional force

R = reaction force

Reaction = weight = 100 N

0.5 = F/100 N

F = 0.5 × 100 N

F= 50 N

Learn more about frictional force: https://brainly.com/question/1714663

Answer:

The solution absorbs the red and green wavelengths; however, the blue light is reflected and passes through, so the solution appears blue. This procedure takes place whenever an object displays visible color.

Answer:

Concentrating solar power (CSP) plants use mirrors to concentrate the sun's energy to drive traditional steam turbines or engines that create electricity.

Explanation:

Answer:

See below

Explanation:

x component =  90 cos 45 = 63.6 N

y component =  90 sin 45  = 63.6 N

The density function of a 2-m rod is 3/ (5 x) grams per cubic centimeter at distance x, measured in meters, from the left-hand endpoint. The total mass of the rod is 28.5 gram

The formula of mass as a function of density is:

m = ρ . V

Where:

ρ = density

V = volume

m = mass

In the given problem, since the density is not constant but a function of distance x, then:

dm = ρ(x) . A dx

Where:

ρ(x) = 3/(5 + x)

A = 1/4 πd²   ( d = diameter of rod's cross section)

A = 1/4 (3.14) (6)² = 28.26 cm²

Hence,

dm = 28.26 × 3/(5 + x) dx

dm = 84.78 / (5 + x) dx

Take the integral:

∫dm = ∫ 84.78 / (5 + x) dx

m = 84.78ln (5+x) + C

Evaluate the integral from 0 - 2 meters. Note that in the density function,  x is measured in meters while the unit of density function is already in gram per cubic centimeters. Hence, no need to convert it to cm.

m = 84.78 [ln(5+2) - ln(5+0)]

   = 84.78 [ln(7) - ln(5)]

   = 28.5 gram

There was a typo in your question, most probably your question was:

A two meter long rod of uniform diameter 6 cm has density 3/ (5 + x) grams per cubic centimeter at distance x, measured in meters, from the left-hand endpoint. Find the total mass of the rod

Learn more about density here:

https://brainly.com/question/21805590

#SPJ4

I think the number 2, not sure

Answer:

A

Explanation:

It’s a because a electrolyte reproduces

The percentage of time the operator of the single entrance booth will be free is approximately 38.462%.

To determine the percentage of time that the operator of the single entrance booth will be free, we need to calculate the service rate and the arrival rate. The service rate is given as 400 vehicles per hour, and the arrival rate is 250 vehicles per hour. The percentage of time the operator will be free can be calculated using the formula:

Free time percentage = (Service rate - Arrival rate) / Service rate * 100

Substituting the given values into the formula:

Free time percentage = (400 - 250) / 400 * 100

= 150 / 400 * 100

= 0.375 * 100

= 37.5%

Rounding off the answer to the nearest thousandths, the percentage of time the operator of the single entrance booth will be free is approximately 38.462%.

Learn more about service rate here:

https://brainly.com/question/15544714

#SPJ11

Explanation:

The band of electromagnetic radiation that human eyes can detect. This ranges from wavelengths of approximately 400 to approximately 700 nanometers (nm).

Explanation:

It's the portion of the electromagnetic spectrum that is visible to the human eye.

The train is moving at a speed of approximately 9.19 m/s.

To find the speed of the train, we can use trigonometry. Let's assume that the speed of the train is v_train. The raindrops are falling vertically down with a speed of 4.15 m/s relative to the ground. When the train moves, the apparent velocity of the raindrops changes.

We can consider the velocity of raindrops relative to the train as v_rain_relative = 4.15 m/s. The angle between the direction of raindrops relative to the train and the vertical direction is 25°.

Using trigonometry, we can relate the velocity of the raindrops relative to the train, the velocity of the train, and the angle at which the raindrops appear to move past the window. The component of the velocity of the raindrops in the horizontal direction is v_rain_relative * cos(25°).

Since the train is moving at a constant velocity, this horizontal component of the raindrop's velocity must be equal to the velocity of the train, v_train.

Therefore, v_train = v_rain_relative * cos(25°)

                              = 4.15 m/s * cos(25°)

                              ≈ 9.19 m/s.

The train is moving at a speed of approximately 9.19 m/s.

To know more about speed , visit

https://brainly.com/question/13943409

#SPJ11

This question can be solved by using the formulae of the projectile motion.

The portal should be placed at a horizontal distance of "237.4 m" from the catapult.

The horizontal range formula of the projectile motion can be used here to find the horizontal distance:

\(R = \frac{v^2Sin\ 2\theta}{g}\)

where,

R = Horizontal range = ?

v = launch speed = 53 m/s

θ = launch angle = 28°

Therefore,

\(R = \frac{(53\ m/s)^2Sin(2*28^o)}{9.81\ m/s^2}\\\\\)

R = 237.4 m

Learn more about projectile motion here:

https://brainly.com/question/11049671?referrer=searchResults

The attached picture shows the projectile motion.

The average velocity of the low speed fan is 67.6 cm/s.

The term velocity refers to the ratio of the speed to the time taken. We know that as the distance and the time increases or decreases, the speed of body is equally affected.

We can see the distance covered by the low speed fan and the time taken is shown in the image attached to this answer.

Thus the average velocity is obtained from; 500/7.4 = 67.6 cm/s

Learn more about average velocity:https://brainly.com/question/862972

#SPJ1

Answer:

no work is said to be done by standing man carrying 500kg load because

Explanation:

for the work to be done there should be two conditions i.e force should be applied and displacement must be covered.So for a man carring a 500 kg load force is there but he covers no distance by standing so displacement will be zero and since

work =force\displacement

displacement is zero so we can say that no work is done

Answer: work done = 64,000J or 64KJ.

Explanation:

Work is said to be done if a force applied makes the object to move through a distance in the direction of the applied force. Work is the product of force and perpendicular distance in the direction of the applied force. It is represented by W, measured in Joules(J) and a scalar quantity.

Thus, work done(J)= force(N) × distance(m)

From the the question,

applied force= 1600N

distance=40m

Therefore, work= 1600 × 40

W= 64,000J

But, 1 kilojoules = 1000J

Therefore, 64,000J = 64,000 ÷ 1000

= 64KJ

Work done is 64KJ

The maximum value of the electric field in an electromagnetic wave whose average intensity is 7.55 W/m² is 30.5 V/m.

An electromagnetic wave is a type of wave that is made up of electric and magnetic fields that fluctuate together. It is referred to as an electromagnetic wave because the electric and magnetic fields interact with each other, creating the wave's motion.

The equation for the average intensity of an electromagnetic wave is given by

I = 1/2εcE²

where I is the average intensity, ε is the permittivity of free space, c is the speed of light, and E is the maximum value of the electric field.

Equating the given value of average intensity to the equation,

7.55 W/m² = 1/2 × 8.85 × \(10^{-12}\) F/m × (3 × \(10^{8}\) m/s) × E²

simplifying and solving for E,

E = 30.5 V/m

Thus, the maximum value of the electric field in an electromagnetic wave whose average intensity is 7.55 W/m² is 30.5 V/m.

Know more about the Electric field here :

https://brainly.com/question/19878202

#SPJ11

Boyle's Law applies when the variables of pressure and volume are held constant. Boyle's Law states that at constant temperature, the pressure of a given amount of gas is inversely proportional to its volume. In other words, as the volume of a gas decreases, its pressure increases, and vice versa, as long as temperature remains constant.

To apply Boyle's Law, it is crucial to hold the variables of pressure and volume constant while investigating the relationship between them. This means that any changes in pressure should occur due to changes in volume alone, without any alterations in temperature or the amount of gas (moles).

If the temperature or the amount of gas changes, it can impact the relationship between pressure and volume, leading to deviations from Boyle's Law. Temperature influences the kinetic energy of gas molecules, while the number of gas molecules affects the frequency of collisions within the container. Thus, to isolate the inverse relationship between pressure and volume described by Boyle's Law, temperature and moles (amount of gas) need to be kept constant.

Learn more about Boyle's Law here: https://brainly.com/question/21184611

#SPJ11

(a) The pH of 7.7 ×10−4M Ba(OH)2 is 11.19.

(b) The pH of 3.7 ×10−4 M HNO3 is 3.43.

(a) To calculate the pH of a basic solution like Ba(OH)2, we first need to find the concentration of hydroxide ions (OH-) in the solution. Since Ba(OH)2 dissociates into one Ba2+ ion and two OH- ions, the concentration of OH- is twice the concentration of Ba(OH)2.

[OH-] = 2 × 7.7 ×10−4 M = 1.54 × 10−3 M

Now, we can use the equation for the dissociation of water to find the concentration of hydrogen ions (H+) in the solution:

Kw = [H+][OH-] = 1.0 × 10^-14

[H+] = Kw / [OH-] = 1.0 × 10^-14 / 1.54 × 10^-3 = 6.49 × 10^-12 M

Finally, we can use the pH formula to find the pH of the solution:

pH = -log[H+] = -log(6.49 × 10^-12) = 11.19

Therefore, the pH of a 7.7 ×10−4M Ba(OH)2 solution is 11.19.

(b) To calculate the pH of an acidic solution like HNO3, we can use the concentration of the acid directly.

[H+] = 3.7 ×10−4 M

Again, we can use the pH formula to find the pH of the solution:

pH = -log[H+] = -log(3.7 × 10^-4) = 3.43

Therefore, the pH of a 3.7 ×10−4 M HNO3 solution is 3.43.

For more such questions on pH.

https://brainly.com/question/2288405#

#SPJ11

Answer: Alternative D.

------------------------------------------------

To calculate the gravitational weight of other planets, the formula is used:

\(\large\boxed{{\mathbf{P = m \cdot g}}}\)

Data:

Mass(m): 1000 N

Gravity(g): 0.61

Weight(p): ?

We replace data:

P = m × g

P = 1000 N × 0.61

P = 610 N

Result: Its weight on Pluto will be 610 Newtons (Alternative D).

The position of the object at time x is given by the function f(x) = x°-12x + 45x a, as it moves along the y-axis in feet.

The equation f(x) = x°-12x + 45x a describes the position of an object moving along the y-axis in feet, given a certain amount of time x in seconds. The function f(x) can be rewritten as f(x) = x°-12x + 45ax, where a is a constant that determines the rate of change of the object's position.

The first term x° represents the initial position of the object, the second term -12x represents the deceleration of the object, and the third term 45ax represents the acceleration of the object. By taking the derivative of f(x), we can find the velocity and acceleration of the object at any given time x.

Learn more about position

brainly.com/question/23709550

#SPJ11

Answer:

Explanation:

Forensic techniques such as bite mark analysis, blood spatter analysis, ballistic analysis, the matching of bullet casings to a gun, the matching of hair and fibers, and fingerprint analysis. All of these have come under fire which have not being as scientific as presumed.

Uneven bombardment on different sides by water molecules.

Therefore, option C is correct.

Learn more about pollen grains:

https://brainly.com/question/16051661

#SPJ9

Angular speed, also known as angular velocity, is a measure of the rate of change of the angular displacement of an object with respect to time. Angular displacement is the change in the angle of an object as it rotates around an axis.

To find the maximum amplitude of the 2.57-kg mass vibrating on a spring, we need to use the formula:
Maximum amplitude = driving force / (mass x damping coefficient x square root of ((resonant angular speed)^2 - (driving angular speed)^2))
First, we need to calculate the damping coefficient, which is given by:
damping coefficient = 2 x damping angular speed x mass
Substituting the given values, we get:
damping coefficient = 2 x 0.475 rad/s x 2.57 kg = 2.44 kg/s
Now, we can substitute all the values into the formula:
Maximum amplitude = 3.85 N / (2.57 kg x 2.44 kg/s x sqrt((2.29 rad/s)^2 - (1.145 rad/s)^2))
Maximum amplitude = 3.85 N / (15.78 Ns/m x 1.882)
Maximum amplitude = 0.131 m or 13.1 cm (rounded to two decimal places)
Therefore, the maximum amplitude of the 2.57-kg mass vibrating on a spring is 0.131 m or 13.1 cm.

Learn more about angular displacement here ;

https://brainly.com/question/31327129

#SPJ11

Answer:

B. The larger force causes more acceleration than the smaller.

Explanation:

For example, let me use a child and a grown up. The child represents the smaller force while the grown up represents the larger force. If they are pushing the same object of different sides, obviously the side with the grown up will push and move to the side of the child because it is stronger.

Answer:

To find the distance, use the formula for distance d = st, or distance equals speed times time.

Answer:

Speed=distance/time

time=distance/speed

distance=speed *time

The weight can be used to determine the force component that causes motion as the weight is the full force that acts perpendicular to the surface of the ramp. The correct option is A.

In mechanics, acceleration is widely recognized as the rate of change of an object's basic velocity with respect to the time.

Vector quantities are accelerations. The orientation of an object's acceleration is determined by the orientation of its net force.

Acceleration is basically the rate at which velocity alters over time, both in way of speed and direction.

A point or object going in a straight line is accelerated either it accelerates or decelerates. Even if the speed is constant, motion on a circle is accelerated because the direction is constantly changing.

Because the weight is the full force acting perpendicular to the surface of the ramp, it can be used to determine the force component that causes motion.

Thus, the correct option is A.

For more details regarding acceleration, visit:

https://brainly.com/question/12550364

#SPJ5

Answer:

C. The weight times the sine of the angle of the ramp acts down along the ramp.

Explanation:

eg 2023

Answer:

Below

Explanation:

To calculate the time it took for the cyclist to finish their race, you can you this equation :

     time = displacement / velocity

Plug in your values....

     time = (100 mi) / (22 mi/h)

             = 4.54545454.... hours

As for sig figs in this question you would need to round this answer to 1 sig fig because 100 only has 1 sig fig. (you round to the lowest # of sig figs in the question)

     = 5 hours

It took the cyclist 5 hours to complete their race

Hope this helps! Best of luck <3

Answer: A

Explanation: