Nicholas sends 20.0 minutes ironing shirts with his 1800-watt irn . How many joules of energy were usedby the iron

Answers

Answer 1

Answer: 1 watt = 1 joule/sec
1800 watts = 1800 joules/sec

   (1800 J/sec) x (20 min) x (60 sec/min)

   = (1800 x 20 x 60) joules = 2,160,000 joules .

   ( 2.16 megajoules )

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Romeo ( mass = 70 kg ) feels a gravitational attraction for Juliet ( mass = 50 kg ). If hey are 20 m apart, find the force.

Work done by the resultant force is always equal to change in kinetic energy a)True b)False

Answers

b) False

The statement is not always true. The work done by the resultant force is equal to the change in kinetic energy only in the absence of other non-conservative forces, such as friction or air resistance. In the presence of such forces, the work-energy theorem may not hold, and the work done by the resultant force may not equal the change in kinetic energy.

Which of the following has the greatest frequency? a loud middle c note a soft middle c note a note lower than middle c a note higher than middle c?

Answers

a note higher than middle c has the greatest frequency. Hence option D is correct.

What is Wave ?

Wave is is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase. Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down. Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.

Wavelength is the distance between two points on the wave which are in same phase. Phase is the position of a wave at a point at time t on a waveform. There are two types of the wave longitudinal wave and transverse wave.

Hence option D is correct.

To know more about frequency :

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Answer:

a note higher than middle c

Explanation:

Deep currents flow along the __________.halocline
ocean floor
ocean surface
thermocline

Answers

Your answer would be that deep currents flow along the ocean floor.

Final answer:

Deep ocean currents primarily flow along the ocean floor, driven by variations in water density. The halocline and thermocline are transitional layers in the ocean, but do not direct deep current flow.

Explanation:

Deep currents in the ocean predominantly flow along the ocean floor. These are also known as deep-ocean or abyssal currents. Unlike surface currents, which are mainly driven by wind, deep ocean currents are driven by variations in water density, which involves factors such as differences in temperature and salinity. The halocline and thermocline refer to transitional layers within the ocean where salinity and temperature change rapidly, respectively. However, they do not necessarily direct the flow of deep currents.

Learn more about Deep Ocean Currents here:

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Jason hits a volleyball with an initial velocity of 6 meters per second straight up. if the back starts at 2 meters above the floor how long will the ball be in the air

Answers

Vi = 6 m/s
d = -2 m
a = - 9.81 m/s^2
t = ?
Formula
d = vi*t + 1/2 a t^2
- 2 = 6m/s *t - .5 * 9.81 * t^2
Put the - 2 on the right.
4.905 t^2 + 6 m/s t +2 = 0
a = -4.905 m/s^2
b = 6 m/s
c = 2 m
t = [- b +/- square root(b^2 - 4ac)]/(2a)
t = [ -6 +/- square root (6^2 - 4*(-4.905)*2)] / (- 4.905*2)
t = [-6 +/- 8.674) / - 9.81
t = -14.674/-9.81
t = 1.69 seconds.

Which form of energy does a plant store when light is transformed during photosynthesis?a. chemical energy
b. thermal energy
c. mechanical energy
d. electrical energy

Answers

The answer is a. Chemical energy.

Photosynthesis is a process in plants wherein light energy is converted to chemical energy, which is then stored as glucose. This is stored in the chloroplasts.

Photosynthesis is divided into two stages: the light and dark stage. In the light stage, the light energy is converted into ATP and NADPH, these are like the energy cells of the plant. After the light stage, the ATP and NADPH that were produced are used in the dark stage. The dark stage will use these energy cells to transform carbon dioxide into sugar.

Answer:

Therefore, a. chemical energy plant store when light is transformed during photosynthesis.

Explanation:

Photosynthesis is the process plants and some algae use to convert light energy to chemical energy stored as sugar within chloroplasts .

Photosynthesis is 6CO2 + 6H20 + light energy = glucose + 6 oxygen.

Photosynthesis is divided into two main stages: light reaction and dark reaction. The light reaction converts light energy into adenosine triphosphate,

A beam of light has a wavelength of 506 nanometers. What is the frequency of the light? What colors is the light?

Answers

Beam Light wavelength = 506 nanometer
Frequency of light = F
The color of light = L

To fine the electromagnetic field:
=> S = wavelength x Frequency
Frequency = (3 x 10^8) / (5.06 x 10^ -7)
F = 5.96 x 10^14 Hz

According to the visible light spectrum, wavelength from 495 to 570 is equals to the color of green. Since the given wavelength is 506, thus, the color of light is green.

F = 5.96 x 10^14 Hz
L = green

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