Answer:
v=u+at
v=21+1.4(11)
v=21+15.4
v=36.4
apparent brightness depends on which two properties?i’ll give brainlist?:)
Answer:
D
Explanation:
I just did it on a p e x
Answer:
D
Explanation:
How much work is done by a 120 N force in 5 meters? *
Answer:
w=f×d
=120×5
=600 j...........
When physical activity is a set plan or program for all ages, usually performed by a group through a local recreational unit, it is called:
a
highly competitive.
b
planned exercise program.
c
sports activity.
d
self-directed.
Answer:
C. Sports activity
Explanation:
A sport activity is a form of competitive physical activity in forms of games. They are normally organized for individuals to participate with the aim of improving physical abilities and skills, bring enjoyment to participants and act as a form of entertainment.
What is specific heat capacity
Answer:
Heat capacity or thermal capacity is a physical property of matter, defined as the amount of heat to be supplied to a given mass of a material to produce a unit change in its temperature. The SI unit of heat capacity is joule per kelvin. Heat capacity is an extensive property
A vat of ethyl alcohol expands
by 0.00823 m^3 when the
temperature is raised by 44.8°C.
What was the original volume of
the alcohol?
Ethyl Alcohol B = 1120 10-C-1
(Unit = m^3)
Answer: .164
Explanation:
1120x10^6 is the coefficient for ethyl alcohol b
(.00823)/(1120x10^-6)(44.8) which gives you your answer: 0.164 m^3
A vat of ethyl alcohol expands by 0.00823 m^3 when the temperature is raised by 44.8°C. The original volume of the alcohol is 0.164m³.
What is volume ?A measurement of three-dimensional space is volume. It is frequently expressed quantitatively using SI-derived units, as well as several imperial or US-standard units. Volume and the notion of length are connected.
The capacity of an object is measured by its volume. For instance, a cup's capacity is stated to be 100 ml if it can hold 100 ml of water in its brim. The quantity of space occupied by a three-dimensional object can also be used to describe volume.
A three-dimensional object's volume is the area it takes up, and it is expressed in cubic units. Cm3 and in3 are two examples of cubic units. The amount of matter in an item can be determined by its mass, on the other hand.
1120 x 10⁶ is the coefficient for ethyl alcohol b
= (.00823 ) / ( 1120 x 10⁻⁶) ( 44.8 )
= 0.164 m³
Thus, The original volume of the alcohol is 0.164m³.
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If we rub a rubber rod against a piece of fur the rod gains a negative change. Why does the rod have a negative charge?
Answer:
because the rod takes electrons from the fur when rubbed across it
Which stars are the youngest?
A) Supergiant
B) White dwarf
C) Blue star
D) Red Dwarfs
A child approaches a stop sign and applies the brakes to slow to a stop. If the bicycle and child were originally traveling at 9.00 m/s and the breaks cause a deceleration of magnitude 1.20 m/s^2, how long will it take the child to stop?
Answer:
7.5secs
Explanation:
Using the equation of motion
v = u + at
v is the final velocity = 0m/s
u is the initial velocity = 9m/s
a is the deceleration = -1.2m/s²
t is the required time
Substitute;
0 = 9 + 1.2(t)
-9 = -1.2t
t = -9/-1.2
t = 7.5secs
hence it takes the child 7.5secs to stop
A ball rolls across the ground and slows to a stop.
Does gravity do work in stopping the ball?
Explain.
(Drawing a picture will help.)
gravity does help the ball since gravity pulls down objects, it causes more friction on the ball therefore causing the ball to slow down faster.
Having Good Posture
A. puts unnecessary strain on joints& ligaments
B. can lead to injury
C. Decreases blood flow to extrmities
D. Is especially important during physical activity
Answer:
D
Explanation: need good posture other wise will injury yourself during activity
A captain of a fishing boat notices that during a certain time each year high tides are higher and low tides are lower. Which conclusion could the captain accurately draw?
Answer:
The Moon is at the closest part of its orbit around Earth; the Sun and the Moon form a straight line with Earth.
Explanation:
The conclusion the captain could draw accurately is that;
The moon is probably at the closest part of its orbit moving round the earth. In addition, that the sun and the moon have formed a straight line with earth. This is due to the fact that high tides are higher and low tides are lower at a particular time each year.
6. A rock is dropped from a bridge. As it falls, its acceleration is 10. What is its speed when it hits the water after falling for 8.17 s?
*Round your answer to the nearest hundredth if necessary.
mn
Answer:
800
Explanation:
bc if you times by ten
If the mirror moves at 1.5m/s towards Peter while Peter remains at rest, what will he observe? Explain your reasoning
Answer:
Peters image will grow bigger
Explanation:
In this situation, only Peter is at rest and the mirror is in motion at 1.5m/s heading towards Peter.
From afar, Peter will look small in the mirror that is his image will be small When the mirror is moved at 1.5m/s Peter being the observer will notice that his image grows bigger and bigger.
Which of the following best describes how nuclear decay rates can be altered?
A. Extreme temperature can alter nuclear decay rates.
B. Environmental conditions do not change the rate of decay for an isotope. Half-life is consistent over time.
C. High pressure can alter nuclear decay rates.
D. A large surface area can alter nuclear decay rates.
A woman does 236 J of work
dragging her trash can 24.4 m to
the curb, using a force of 18.9 N.
At what angle was her force
directed?
(Unit = degrees)
Answer:
The woman's force was directed 59.22⁰ to the horizontal.
Explanation:
Given;
work done by the woman, W = 236 J
distance through the load was moved, d = 24.4 m
applied force, F = 18.9 N
inclination of the force, = θ
The work done by the woman is calculated as;
W = Fdcosθ
[tex]cos \ \theta = \frac{W}{Fd} \\\\cos \ \theta = \frac{236 }{18.9 \times 24.4} \\\\cos \ \theta = 0.5118\\\\\theta = cos^{-1} ( 0.5118)\\\\\theta =59.22^0[/tex]
Therefore, the woman's force was directed 59.22⁰ to the horizontal.
Answer:
59.22⁰
Explanation:
Which formula can be used to find the X component of the resultant vector?
Answer:
If you are simply looking for the X component then the most applicable formula from the choices given is Tx + Ux+ Vx. This means that you will add all x-components. For example: If a man walking along the x-axis walks 10 meters to the right, 5 back and 2 meters forward, what is the resultant vector?
What happens as the frequency of a wave increases?
Answer:
The number of complete wavelengths in a given unit of time is called frequency (f). As a wavelength increases in size, its frequency and energy (E) decrease. From these equations you may realize that as the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer.
Explanation:
please mark me as brainliest thank you
The number of complete wavelengths in a given time is called frequency (f). As a wavelength increases in size, its frequency and energy (E) decrease.
what is frequency ?The frequency referred to the number of oscillation per unit time and it is used for defining the cyclic process like rotation, oscillation, wave etc.
The SI unit is denoted as Hertz and the symbol λ represents it where one hertz means the wave completed one cycle in one second.
The frequency explains the phenomenon of oscillatory and vibration like the mechanical vibration, sound signals, light, frequency waves etc. The “period” represented as the time required by the wave for one oscillation, i.e., it is inversely proportional to the frequency.
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what is meaning of saniya?
Answer:
“brilliant, radiant, splendid”.
Explanation:
Question 3 (1 point)
The nucleus occupies most of the space of an atom
True
O False
Answer:
the correct answer is false
A trolley of 20kg move 60 gm.Find out the work done by the trolley.
Answer:
11760
Explanation:
m= 20kg
d= 60 m
work done = force .distance= 20*9.8*60= 11760Nm
how does the eye control the amount of light entering it?
Answer: Hello there
Explanation:
The colored part of the eye which helps regulate the amount of light entering the eye. When there is bright light, the iris closes the pupil to let in less light. And when there is low light, the iris opens up the pupil to let in more light. Focuses light rays onto the retina.
Choose the polar molecule.
A. C
B. CH4
C. H20
D. F2
Answer : H20
Explanation:
If the work done on a object is 100 J and it comes to a rest on a surface with a mass of 10
kg and a SHC of 1000 J/kg-C calculate the change in temperature.
Compare the speed that light waves travel in air to the speed that sound waves travel in the air. How many times faster do light waves travel in air in comparison to sound waves in air?
Answer:
As a rule sound travels slowest through gases, faster through liquids, and fastest through solids. The speed of light as it travels through air and space is much faster than that of sound; it travels at 300 million meters per second or 273,400 miles per hour. ... Speed of light in glass = 200 million m/s or 182,300 mph.
Explanation:
Almost always sound travels slowest via gases, faster via beverages, and fastest via solids. The velocity of light because it travels via air and area is a great deal quicker than that of sound; it travels at 300 million meters consistent with 2d or 273,400 miles in step with hour.
The pace of light in glass = 2 hundred million m/s or 182, 300 mph.
How are light waves and sound waves extraordinary?Mild waves are electromagnetic waves whilst sound waves are mechanical waves. Mild waves are transverse even as sound waves are longitudinal. Light waves can tour in a vacuum. Sound waves require a material medium to journey, and as a result, can not travel in a vacuum.
Nothing can travel faster than light except for sound. This is the declaration of a few US physicists, who say they've designed an unusual waveguide to make the sound move at “superluminal” speeds (Appl. Phys.
In 2015, a team of Scottish scientists announced that they had found a way to gradual the rate of mild. By sending photons via a unique mask, the researchers altered their shape. In this malformed kingdom, these infinitesimal particles of light traveled slower than normal photons.
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A bat emits a pulse of sound of wavelength 0.0085 m. Calculate the frequency of the sound.
Answer:
v = 4.0 10⁴ Hz
Explanation:
The bat emits sound in the air, so we can use the speed of sound in air
v = 344 m / s
also the expression that relates the wavelength and frequency with the speed of the wave
v = λ f
f = v / λ
let's calculate
v = 344/0.0085
v = 4.0 10⁴ Hz
HI thts way tooo much to answer but ye...d;
how do mass and distance affect the force of gravity between on objects
The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them. This means that the force of gravity increases with mass, but decreases with increasing distance between objects.
You and your friends are playing tug of war. Your team pulls with a force of 55 N, to the right. The other team pulls with a force of 65 N to the left. What is the net force on the rope
Answer:10 N
Explanation:
Subtract them and u will see it will be 10n so the net force will be 10 n why you should subtract them is because
They both are different amounts
Different forced of strength
Different N numbers
Think of it like the is an unequal amount of student so one side has 2 students and the other side has 4 students
49. A 6.1-kg bowling ball is liſted 2.1 m to a shell. Find
the increase in the ball-Farth system's energy.
Answer:
125.5J
Explanation:
Given parameters:
Mass of the bowling ball = 6.1kg
Height of lifting = 2.1m
Unknown:
Increase in the ball energy = ?
Solution:
The ball has changed position by moving it from one point to another. So, it has acquired more potential energy.
Potential energy = mgh
m is the mass
g is the gravity
h is the height
Now insert the given parameters and solve;
Potential energy = 6.1 x 9.8 x 2.1 = 125.5J
10) If you shine blue and red light on a white object it appears to be violet. * 1 point
True
Or
False
Answer:true
Explanation:
- What is an earthquake?
Answer:
A earthquake is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves