Which of the following questions would be answered using concepts from physics?A. What are the forces that cause a pendulum to swing?

B. How does rust form from iron and water?

C. How high will a thrown object rise before gravity pulls it back to Earth?

D. In what ratio do hydrogen and oxygen combine to form water?

Answers

Answer 1

Answer: A.what forces cause a pendulum to swing? B.how high will a thrown object rise before gravity pulls it back to earth?

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Which element is classified as an alkali metal?

Which explains the greenhouse effect? A.Greenhouse gases like water vapor and carbon dioxide release heat in the atmosphere, thereby radiating heat energy back into space.

B.Greenhouse gases like water vapor and carbon dioxide trap heat in the atmosphere, thereby radiating heat energy back to the surface.

C.Greenhouse gases like water vapor and carbon dioxide trap heat in the atmosphere, thereby radiating heat energy back into space.

D.Greenhouse gases like water vapor and carbon dioxide trap heat in the atmosphere, thereby radiating heat energy back into space.

Answers

Since greenhouse gases are a main cause of global warming, so the answer must be B.

Average amount of time wind machines operate

Answers

The wind machine on an average operates for a time of about $\boxed{3-4\text{ hours}}$ .

Explanation:

The wind energy is the method of using the energy carried by the wind to generate the power. The wind energy is the considered as the conventional and clean source of energy.

The wind machines require the high power winds to rotate the blades of the windmill and produce power using the energy of the moving wind.

The winds blow at such high speed for a very small time during the day, the wind machine cannot be expected to work for a longer time during the whole day.

The wind energy can be obtained form a wind mill for a limited time unlike the other form of energy like thermal energy or even the solar energy. The thermal energy can be obtained at anytime due to burning of fuel whereas the solar energy can at least be obtained during the whole day time.

Thus, the wind machine on an average operates for a time of about $\boxed{3-4\text{ hours}}$ .

Learn More:

1. Acceleration of the box under friction brainly.com/question/7031524

2. The kinetic energy of an object depends on the brainly.com/question/137098

3. The approximate time taken to walk for 2000 miles brainly.com/question/3785992

Answer Details:

Grade: Middle School

Subject: Physics

Chapter: Energy

Keywords:

wind energy, conventional source, energy, thermal, solar, 3-4 hours, high speed, machine, time, operate.

Tarzan swings on a 31.0 m long vine initially inclined at an angle of 36.0◦ with the vertical. The acceleration of gravity if 9.81 m/s 2 . What is his speed at the bottom of the swing if he a) starts from rest? Answer in units of m/s

Answers

Answer:

$v=10.777m/s$

Explanation:

Tarzan swing can be thought of as change in potential energy by going from higher location We solve for height of beginning of the swing by using simple cosine equation:

$31Cos36=25.08\nE_(potential)=mgh\n$

ΔE=mg(h₂-h₁)

$=m*9.81(31-25.08)\n$

The potential energy of Tarzan initial position is converted into kinetic energy of his swing.By using kinetic equation

$E_(kinectic)=P_(potential)\n1/2mv^(2)=m*9.81(31.0-25.08)\n(1/2)v^(2)=9.81(31.0-25.08)\n0.5v^(2)=58.07\nv^(2)=58.07/0.5\nv=√(58.07/0.5)\n v=10.777m/s$

A particle moves horizontally in uniform circular motion, over a horizontal xy plane. At one instant, it moves through the point at coordinates (2.50 m, 2.50 m) with a velocity of -5.00i hat m/s and an acceleration of -10.0j m/s2. What are the coordinates of the center of the circular path?

Answers

Answer:

(2.5,0)

Explanation:

The particle can be described by the following equations:

$x=Rsin(-\omega t)+2.5\ny=Rcos(-\omega t)\n(dx)/(dt)=-\omega Rcos(-\omega t)\n(dy)/(dt)=\omega Rsin(-\omega t)\n(d^2x)/(dt^2)=-\omega^2Rsin(-\omega t)\n(d^2y)/(dt^2)=-\omega^2Rcos(-\omega t)$

For R = 2.5, ω = 2 and t = 0:

$x=2.5\ny=2.5\n\n(dx)/(dt)=-5\n (d^2y)/(dt^2)=-10$

The center of the circle would be at point (2.5,0)

A codec ________. a. converts binary voice signals into digital signals for transmission
b. encrypts the signal
c. encodes voice sounds into analog signals for transmission
d. encodes voice sounds into digital signals for transmission

Answers

Answer:

Explanation:

A codec is used for encoding

In a series circuit containing two unequal resistors, higher power is developed in the

Answers

In a series circuit, the current that passes through both resistors is equal. What determines the power in that element would be the value of the resistance. In terms of current and resistance, power would be equal to the square of current multiplied by the resistance. So having a higher value of resistance would result in higher power.

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You are a passenger in a truck that gets stuck in mud. You and the driver use a tree branch as a lever to lift up the truck. You apply an effort force of 600 N to the branch. The back of the truck weighs 2400 N. What is the mechanical advantage of the branch-lever?

A quantity has a measured value of 8.4126. which number value has the uncertainty?

Millikan measured the electron's charge by observing tiny charged oil drops in an electric field. Each drop had a charge imbalance of only a few electrons. The strength of the electric field was adjusted so that the electric and gravitational forces on a drop would balance and the drop would be suspended in air. In this way the charge on the drop could be calculated. The charge was always found to be a small multiple of 1.60 × 10-19 C. Find the charge on an oil drop weighing 1.00 × 10-14 N and suspended in a downward field of magnitude 2.08 × 104 N/C.

An unknown substance has a mass of 0.125 kg and an initial temperature of 90.5°C. The substance is then dropped into a calorimeter made of aluminum containing 0.285 kg of water initially at 29.5°C. The mass of the aluminum container is 0.150 kg, and the temperature of the calorimeter increases to a final equilibrium temperature of 32.0°C. Assuming no thermal energy is transferred to the environment, calculate the specific heat of the unknown substance.