answer:52
Explanation: add 50+0.20=52
What is the net force on a race car with a mass of 1200 kg if its acceleration is 32.0m/s2 West?
Answer:
38400N
Explanation:
F=mass×acceleration
=1200×32
=38400
What is the wavelength of a wave?
22. Cindy created a solenoid by coiling a copper wire and attaching it to a battery.
process has generated a magnetic field around the solenoid. Which of the following could Cindy
do to increase the magnetic field?
2. decrease the number of coils in the wire
b. increase the number of coils in the wire
c. decrease the voltage of the battery
dadd a plastic core to the solenoid
23. What is an electric motor?
a machine that converts energy from electricity into mechanical energy
b. a machine that converts energy from mechanical energy into electricity
c. a machine that converts energy from chemical energy into mechanical energy
d. uses combustion to create mechanical energy
_24. What is a generator?
a.
a machine that converts energy from electricity into mechanical energy
b. a machine that converts energy from mechanical energy into electricity
a machine that converts energy from chemical energy into mechanical energy
d. uses combustion to create mechanical energy
C.
I need help with all three
Answer:
its b
Explanation:
trust me
If the initial velocity of a ball is sent straight upward at 10.5m/s from the ground what will its final velocity be when it hits the ground at the end of its flight?
Answer: -10.08 m/s
Explanation:
Here we only need to analyze the vertical problem.
When the ball is in the air, the only force acting on it will be the gravitational force, this means that the acceleration of the ball, is equal to the gravitational acceleration, then:
a(t) = -9.8m/s^2
Where the negative sign is because gravity pulls the ball down.
To get the velocity equation we need to integrate over time, we get:
v(t) = (-9.8m/s^2)*t + v0
Where v0 is the initial vertical velocity, here it is v0 = 10.5 m/s
Then the velocity equation is:
v(t) = (-9.8m/s^2)*t + 10.5 m/s
To get the position equation, we need to integrate again over time, we get:
p(t) = (1/2)*(-9.8m/s^2)*t^2 + (10.5 m/s)*t + p0
Where p0 is the initial position, we know that the ball is sent upward from the ground, so p0 = 0m
Then the position equation is:
p(t) = (1/2)*(-9.8m/s^2)*t^2 + (10.5 m/s)*t
Now we need to find the value of t such that the position is equal to zero (this means that the ball hits the ground again).
Then we need to solve:
p(t) = 0 = (1/2)*(-9.8m/s^2)*t^2 + (10.5 m/s)*t
If we divide both sides by t, we get:
0 = (1/2)*(-9.8m/s^2)*t + (10.5 m/s)
Now we can solve it:
(1/2)*(9.8m/s^2)*t = 10.5 m/s
t = (10.5 m/s)/((1/2)*(9.8m/s^2)) = 2.14 s
This means that after 2.14 seconds, the ball will hit the ground again.
The velocity of the ball when it hits the ground is equal to:
v(2.14s) = (-9.8m/s^2)*2.14s + 10.5 m/s = -10.08 m/s
The paper record of the earthquake data
Which statement best defines constructive interference? O Energy reflects back toward the source of its power. O Two waves with identical crests and troughs meet. thing O A wave appears to be at a standstill and vibrates in place O The trough of one wave matches the crest of another.
Answer:
when the trough of one wave matches the crest of another
Explanation:
just took the test
True or False. In a parallel circuit, the voltage is the same anywhere in the circuit.
Answer:
true
Explanation:
in a parallel circuit, the voltage is the same
if a wave has to travel 600 m and its wavelength is 0.4 m, with a frequency of 500 Hz. How much time will it take for the wave to travel 600 m?
Answer: 3 s
Explanation:
i took the test in physics :)
The time taken by the wave to travel the distance is 3 seconds.
What is meant by frequency of a wave ?
Frequency of a wave is defined as the number of oscillations or cycles completed by the wave within one second.
Here,
Distance travelled by the wave, d = 600 m
Wavelength of the wave, λ = 0.4 m
Frequency of the wave, f = 500 Hz
The expression for the velocity of the wave is given by,
v = fλ
v = 500 x 0.4
v = 200 m/s
Therefore, the time taken by the wave to travel the distance of 600 m can be given as,
Time taken = displacement/velocity
So,
t = d/v
t = 600/200
t = 3 s
Hence,
The time taken by the wave to travel the distance is 3 seconds.
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The kinetic energy of an object is equal to one half Its mass multiplied by its
speed
A squared
B cubed
C to the fourth power
D to the fifth power
explain Heat with its unit
Answer:
As a form of energy, heat has the unit joule (J) in the International System of Units (SI). However, in many applied fields in engineering the British thermal unit (BTU) and the calorie are often used. The standard unit for the rate of heat transferred is the watt (W), defined as one joule per second
Explanation:
Hope it helps
A lever was used to life heavy rock. The input force was 150 N and the output force was 500 N. What was the mechanical advantage of the pulley?
STUDY QUESTIONS
1. (a) You are provided with a 15 cm long steel strip,
By using a permanent bar magnet explain how
you will magnetise the steel strip
Answer:
The blade of sharpener is made up of iron. Iron is a magnetic material because of this pencil sharpener gets attracted by the poles of a magnet although the body is made up of plastic.
If the sound level at a point is 98.0 dB, what is the intensity of sound at that point (Unit=W/m^2)? please help will give brainliest
Explanation:
The decibel scale is a logarithmic scale where each bel or 10 decibels correspondents to a factor of ten. A power intensity of 10^(-12) watts per square meter is the standard reference for a SPL of 0 db. So an SPL of 98 db corresponds to a power intensity of 10^(9.8)*10^(-12) or 10^(9.8–12) w/m^2.
0.006309573 w/m^2.
A 10.0 kg mass is lifted 5.0 m above the ground.
Find the change in gravitational energy.
Answer:
500 J
Explanation:
formula of Energy is: E=mass*height*g, where g≈10 (m/s²).
according to the formula above: E=10*5*10≈500 (J)
While riding a horse, the horse suddenly comes to an abrupt stop. You fly forward and
fall over the front of the horse.
What is the Newton law?
Answer:
For every action there is an opposite reaction.
Explanation:
Emma draws another diagram showing how adding energy affects this wave. How does her new diagram compare to this diagram?
A
Her diagram shows higher wavelengths.
B
Her diagram shows lower wave amplitudes.
С
Her diagram shows lower wave frequencies.
D
Her diagram shows higher wave amplitudes.
HELPPPP MEEE PLEASEEEE 55 POINTS!!!
What is the angular displacement In radians of a wagon that moves 270 around a circle path
Answer:
dont go to link they will track u
Explanation:
Which type of wave can travel without a medium?
A. Mechanical wave
B. Light wave
C. Seismic wave
D. Sound wave
Tell me, Is universe created due to big bang???? Plz I want a bunch of para
Answer:
shreya Sister's answer is correct hope it's help you have a good day
A book that weighs 5 newtons is sitting on a table 1.5 meters above the floor. How much gravitational potential energy does the book have?6.5 joules
4.5 joules
7.5 joules
3.33 joules
Answer:7.5J
Explanation:7.5
J
Explanation:
P
E
=
m
g
h
Since
F
=
m
g
in this case
P
E
=
F
h
P
E
=
5
N
⋅
1.5
m
=
7.5
Where is the moon? Please help?
Fifty grams of ice at 0◦ C is placed in a thermos bottle containing one hundred grams of water
at 6◦ C. How many grams of ice will melt? The heat of fusion of water is 333 kJ/kg and the
specific heat is 4190 J/kg · K.Immersive Reader
Answer:
7.55 g
Explanation:
Heat of fusion = 333kj/kg
Heat capacity, c = 4190 j/kg /k
Heat capacity in j/g /k = 0.4190
Let the Number of grams of ice that will melt = n
Number of grams * heat of fusion = heat capacity * temperature change
n * 0.333 = 0.419 * (6-0)
0.333n = 2.514
n = 2.514 / 0.333
n = 7.5495
n = 7.55 gram
Hence, the number of gram of ice that will melt is 7.55 grams
PLEASE HELP ME WITH THIS ONE QUESTION
A tuning fork of 500 Hz is struck in a room with a speed of sound of 340 m/s. What is the distance between a point of rarefaction and the next compression point, in the resulting sound?
Answer:
Wavelength = 0.68 meters.
Explanation:
Wavelength gives the distance between a point of rarefaction and the next compression point, in the resulting sound.
Given the following data;
Frequency = 500 Hz
Speed of sound = 340 m/s
To find the wavelength;
Wavelength = speed/frequency
Wavelength = 340/500
Wavelength = 0.68 meters
This glass of lemonade is sitting in the hot summer sun. As time passes, in which direction will heat transfer take place?
A.
ice → lemonade
B.
lemonade → air
C.
air → lemonade
D.
ice → straw
E.
ice → air
Answer:
c
Explanation:
Answer:
the answer to your question is c
Explanation:
Do you think this protist can
make its own food? Explain.
Answer:
Animal-like protists are those which cannot make their own food. These protists have the ability to move themselves and are often further subdivided into groups based on how they move. Plant-like protists are those that make their own food using sunlight and water. They can live in water or on trees.
Explanation:
A coke can that has been shaken and then opened
Answer:
will explod
Explanation:
state two precautions to be taken when using a density bottle
Explanation:
(i) The density bottle must be held by the neck to avoid expansion. (ii). The outside must be wiped clean. (iii).
Answer:
The density bottle must be held by the neck to avoid expansion The outside must be wiped cleanExplanation:
hope this helpwhat is resistance
Answer:
Resistance is the measure of the opposition to current flow in an electrical circuit
Resistance refers to the opposition or hindrance that a material or object offers to the flow of electric current. It is a fundamental concept in the field of electrical engineering and physics.
Resistance is measured in ohms (Ω) and is denoted by the symbol "R."
In electrical circuits, resistance is caused by various factors, including the type of material, its dimensions, and its temperature.
The primary element contributing to resistance is the collisions between electrons and atoms within the material through which the current is passing.
When an electric current flows through a conductor, such as a wire, the electrons move along the path of the conductor. However, as they do so, they encounter resistance.
This resistance causes the electrons to collide with atoms, which generates heat and dissipates energy.
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PLEASE HELP!!!!!!
Is this correct?
A form of energy NOT associated with the particles of objects is
thermal energy
mechanical energy
nuclear energy
chemical energy
Answer:
mechanical energy
Explanation:
because except mechanical energy all posseses particles