Answer:
Because always when we do an experiment, we need something to compare.
For example, if we want to see how much change a given color paint when we add different amounts of white paint to it, we need to have at least one sample of pure color paint, so we can compare it whit the ones with mixed paints.
Well, the case of the polygraph is exactly the same, we need to have a baseline, so we the interviewer can see if for some questions there is a change in the line compared with the baseline.
What is the velocity of a freely falling object 10 seconds after it is released from rest?
Answer:
around 98 meters per second.
Explanation:
Instantaneous velocity can be found with a equation.
Vf=Vi+At
Since it fell and had no initial velocity the equation becomes
Vf=At
The Acceleration is 9.8 m/s^2
So the velocity of it fell for ten seconds is
Vf=9.8m/s^2 * 10
Vf= 98 m/s
what is the property of medium
Answer:tension, density, temperature and elasticity
Explanation:
hELP URGENT PLEASEE!!!
Answer:
1. Solid, liquid, gas, plasma
3. latent heat of vaporization
4. melting
6. heat
7. amount of heat transferred when 1g of a substance melts or freezes
Answer:
1. Solid, liquid, gas, plasma
2. In a solid and liquid, the particles are close together. In a solid, the particles are packed close together and are held in a fixed position. ... In liquids, particles are usually almost as close to each other as in solids.
3. latent heat of vaporization
4. melting
5. As the temperature falls, the particles slow down. If a liquid is cooled sufficiently, it forms a solid.
6. heat
7. amount of heat transferred when 1g of a substance melts or freezes
Explanation:
Textbook online
Please help it’s physics and I suck at this subject :(
o be useful in science, a hypothesis must be *
A. measurable
B. observable
C. testable
D. correct
Answer:
the answer is c testable
Why is speed a scaler quantity
Answer:
Speed is a scalar quantity it is the rate of change in the distance travelled by an object, while velocity is a vector quantity it is the speed of an object in a particular direction.
A goose is flying due south at 20 km/hr, the goose is flying into a 15 km/hr due north wind. What is the gooses resultant velocity?
Answer:
5 km/hr due south
Explanation:
We need to subtract the two velocities due to the fact that they are in opposite directions (one due south and the other one due north). Then, for an observer located on earth, the goose will be flying at :
20 km/hr - 15 km/hr = 5 km/hr
Which of the following is a vector quantity?
A. 30 miles
B. 30 mph northwest
C. 55 m/s
D. 20 mph
Answer:
B) 30 mph northwest
Explanation: Vector quantities have both direction and magnitude. In this case the direction is northwest, and magnitude is 30 mph.
The following is a vector quantity, 30 mph northwest. Option B is correct.
What is a vector quantity?A vector quantity is a physical quantity that has both magnitude and direction. Examples of vector quantities include displacement, velocity, acceleration, force, and momentum.
In contrast, a scalar quantity is a physical quantity that has only magnitude and no direction associated with it. Examples of scalar quantities include speed, distance, mass, temperature, and time.
Here,
A vector quantity is a physical quantity that has both magnitude and direction. In this case, the magnitude is 30 mph and the direction is northwest, which makes it a vector quantity.
Option A is a scalar quantity because it only has a magnitude, but no direction associated with it. Option C is also a vector quantity because it has both magnitude and direction, but it is not given a direction in the question. Option D is a scalar quantity because it only has a magnitude.
Thus, the following is a vector quantity, 30 mph northwest. Option B is correct.
Learn more about vector quantity here:
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erson jogs 3.5 kilometers in 35 minutes, then 1.5 kilometers in 20 minutes, and finally 1.2 kilometers in 22 minutes. What is the jogger's average speed in km/min?
Answer:
3.5+35
1.5+1.2
20+22
42 + 16
= 58 ¹²
a cheerleader throws herself into the air with a velocity of 12 m/s at an angle of 75 degrees above the horizontal. what are the x- and y components of her velocity (show work)
Answer:
Vx = 3.10 [m/s]
Vy = 11.59 [m/s]
Explanation:
To solve this problem we must decompose the velocity vector by means of the angle on the horizontal.
v = 12 [m/s]
Vx = 12*cos (75) = 3.10 [m/s]
Vy = 12*sin (75) = 11.59 [m/s]
If an object weighs 20 N and is sitting on the floor without moving, what must be the normal force of the floor acting on the box?
20 N up
20 N down
10 N up
10 N down
Answer:
20 N up
Explanation:
Since the object on the floor is sitting still. Based on Newton's law of force. Objects must have equal reaction and force against each other for still objects. So the answer is 20 N up. Since the force are equal on both sides making the object not moving.
A 6.46 kg object moving with a velocity of 5.23 m/s is struck from behind by a moving 11.77 kg object. They stick together, moving off with a mutual velocity of 17.93 m/s. What was the original velocity of the 11.77 kg object before the collision?
Answer:
its z trust me
Explanation:
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please helpp meee write the analysis and then answer the next pic
Which of the following describes the rate at which work is done?
Force
Energy
Power
Impulse
Answer:
power
Explanation:
If nitrogen, which has an electronegativity of 2.0, bonda with hydrogen, which has an electronegativity of 2.1, the bond between the two atoms will be classified as a(n) _________ covalent bond.
Answer: it’s Nonpolar
Explanation:
Atoms with small differences in their electronegativities are said to form nonpolar covalent bonds.
Answer:
caden
Explanation:
How long does it take sound to travel 3525 meters (speed of sound is 330 m/s)?
5 health benefits of physical activity
Answer:
reduce your risk of a heart attack.
manage your weight better.
have a lower blood cholesterol level.
lower the risk of type 2 diabetes and some cancers.
have lower blood pressure.
have stronger bones, muscles and joints and lower risk of developing osteoporosis.
CAN SOMEONE PLZ HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
what is the winning game for badminton??? at least 5 sentence
Answer:
please give me more stars
Explanation:To win a game, a player must reach 21 points. However, if the game is tied at 20-20 (or 20-all) then you are required to win by two clear points. Unlike most sports, however, if the score becomes 29-29 (or 29-all), the player or team to score the 30th point will win the game.
A frog falls from its rainforest tree. If we ignore wind resistance, (a) how much time does it take the frog to fall a distance of 12.0 m? (b) how fast is the frog falling at this point?
Answer:
Explanation:
a) Using the equation of motion
S = ut + 1/2gt²
S is the distance of fall
g is the acceleration due to gravity
t is the time taken
Given S = 12.0m, g = 9.81m/s^2, un= 0m/s
12 = 0+1/2(9.81)t²
12 = 4.905t²²²
t² = 12/4.905
t² = 2.446
t = √2.446
t = 1.56secs
b) To determine how fast is the frog falling at this point, we need to calculate the speed of the frog. Using the equaton v = u+gt
v = 0+9.81(1.56)
v = 15.34m/s
Hence the frog is falling at the rate of 15.34m/s
PLEASE HELP!!!
What is the sum of all forces that act upon an object called?
a
Net force
b
Balanced force
c
Unbalanced force
d
Gravitational force
Answer:
net force
Explanation:
The net force is the vector sum of all the forces that act upon an object. That is to say, the net force is the sum of all the forces, taking into account the fact that a force is a vector and two forces of equal magnitude and opposite direction will cancel each other out.
Answer:
a
Explanation:
A 2 kg object is moving at a constant velocity of 15 m/s. What is its acceleration?
Answer:
The acceleration of the object is 0 m/s^2.
Explanation:
To solve this problem, we must remember that acceleration is equal to the change in velocity per unit time. Since we are given that the velocity is constant, this means it is unchanging, and the acceleration is therefore zero.
Hope this helps!
Which statement best describes the purpose of the vacuum inside a thermos?
A. It prevents particles from transferring thermal energy between the inner and outer bottles.
B. It increases heat loss through conduction between the outer and inner bottles.
C. It prevents heat loss through radiation, which requires matter to transfer energy.
D. It allows for more collisions between the particles that make up the outer and inner bottles.
Answer:
I think its a.
Explanation:
1 hr 16 minutes equal how many minutes ?
Answer:
76 minutes.
Explanation:
There are 60 minutes in an hour + 16 minutes= 76 minutes.
Which is an example of static friction?
a. pulling a skier behind a boat
b. pushing a box that is at rest
c. braking a car going down a hill
d. driving a car up a hill
Answer:
static friction is developed between 2 surfaces in state of rest so i think answer is c.Even though the wheel is in motion, the patch of the tire in contact with the ground is stationary relative to the ground, so it is static rather than kinetic friction.
The static friction is the hindrance to an object which is trying to move from stationary state. Among the given options, the example for static friction is pushing the box that is at rest.
What is static friction?The friction that occurs when people attempt to move a stationary object on a surface without actually causing any relative motion between the body and the surface.
The static frictional force is self-regulating, which means that it will always be equivalent to and opposite to the force applied. Static friction is zero for an object at rest on a flat table.
Static friction creates an equal and opposite force that keeps the book at rest when you push horizontally with a small force.The static friction force increases to match the force as you push harder.
The maximum static friction force is eventually exceeded, and the book moves. Therefore, option B is correct.
To find more on static friction, refer here:
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If I have 10 m 20 N how much work do I have
Answer:
200 joule
Explanation:
force= 20N
distance=10m
work= ?
we know,
work= force×distance
=20N×10m
=200Nm or joule.
what we call the state in a human body if cerebrum is not functioning well
you walk at a speed of 1.5 m/s and it takes you 1800 seconds to get to your friends house. if you follow the same route, how fast would you need to travel to get there un 600 seconds
Answer:
4 miles per hour
Explanation:
Your welcome
Define time interval in your own words.
Answer:
An interval is a distinct measure of time or the physical or temporal distance between two things.
Explanation:
If your awesome, click here and be the first, to be the brainest
Answer:
im awesomeee
Explanation:
.
Answer:
Doubt I'll be first but imma try
Explanation:
What phase of the moon would this be?
1st quarter, waxing half moon
3rd quarter, waning half moon
waxing gibbous
waning gibbous
Answer:
First Quarter
Explanation:
