Answer:
False
Explanation:
Low humidity is typically associated with cold temperatures since cold air holds less water compared to warm air. While it is possible for indoor humidity to be as low as 10%, most people generally find humidity levels of about 40 to 45 percent comfortable.
A mover uses a pulley to lift a 2500N piano up to a second story balcony. The mover pauses to wipe sweat from his forehead while holding the rope tight in one hand. Since the piano is not moving at this time, what is the tension force in the rope while the piano is dangling still in the air?
Answer:
2500 N
Explanation:
Tension force may be defined as the force which is transmitted along a cable, rope, or through a string which is stretchable and is puled tight by the forces acting from the opposite sides. It is directed along the length of the string or the rope.
In the context, a pulley string holds a 2500 N piano that is used to lift it to second story balcony. When the piano is held stationary by the mover, the tension force acting on the rope is the weight force or the gravitational force that acts on the piano which is 2500 N. The tension force balances the the weight force of the piano when it is not moving.
The sixth grade teachers are planning a field trip. They want to divide the 192 students evenly on the four buses. How many students will ride each bus?
Answer:
48 students will ride on each bus.
Explanation:
192 students divided by 4 busses comes out to 48 students per bus.
Basically: 192/4=48
Can someone help please I will give brainliest
A box at rest is in a state of equilibrium half way up on a ramp. The ramp has an incline of 42° . What is the force of static friction acting on the box if box has a gravitational force of 112.1 N ?
Answer:
Explanation:
The force of static friction acting on the box is the frictional force;
Frictional force Ff = Wsin theta (force acting along the ramp)
W is the gravitational force known as the weight
Ff = 112.1sin42°
Ff = 112.1(0.6691)
Ff = 75.00N
Hence he force of static friction acting on the box if box has a gravitational force of 112.1 N id 75.00N
Answer:
75N i did test
Explanation:
What is thermodynamics?
the movement of energy
the classification of energy
the way energy changes
the movement of heat
Answer:
The movement of energy
Explanation:
Answer:
the movement of energy
A 50 Kg football player is standing still when he experiences an inelastic collision with a 150 Kg football player who is traveling at 10 m/s. What is the velocity of the player immediately after the collision?
Answer:
V = 7.5 m/s
Explanation:
Given that,
Mass of player 1, m₁ = 50 kg
Mass of player 2, m₂ = 150 kg
50 kg player stands still and 150 kg player is traveling at 10 m/s
We need to find the velocity of the player immediately after the collision. As the inelastic collision occurs. The linear momentum will remain conserved. After the collision, let they move with a constant velocity say V.So,
[tex]m_1u_1+m_2u_2=(m_1+m_2)V\\\\V=\dfrac{m_1u_1+m_2u_2}{(m_1+m_2)}\\\\=\dfrac{150\times 10}{(50+150)}\\\\=7.5\ m/s[/tex]
So, the velocity of the player immediately after the collision is 7.5 m/s.
You want to push a 71-kg box up a 16° ramp. The coefficient of kinetic friction between the ramp and the box is 0.23. With what magnitude force parallel to the ramp should you push on the box so that it moves up the ramp at a constant speed?
Answer:
345.60N
Explanation:
The magnitude of the force parallel to the ramp that will push the box up the ramp are the frictional force(Ff) and the moving force Fm
Total force = Ff + Fm
Ff = ηR
Ff = ηmgcosθ
Fm = Wsinθ
Fm = mgsinθ
Total force = ηmgcosθ + mgsinθ
Total force = mg(ηcosθ + sinθ)
Given
mass m = 71kg
acceleration due to gravity g = 9.8m/s²
angle of inclination θ = 16°
coefficient of friction η = 0.23
Substitute into the formula;
Total force = 71(9.8)(0.23cos16 + sin16)
Total force = 695.8(0.2211+0.2756)
Total force = 695.8(0.4967)
Total force = 345.60N
Hence the magnitude force parallel to the ramp that you should push on the box so that it moves up the ramp at a constant speed is 345.60N
What makes the yardstick test a direct measurement of reaction time?
A.
The further the yardstick falls, the slower the reaction time.
B.
Yardsticks have numerical markings for length.
C.
Yardsticks are designed to measure reaction time.
D.
all of the above
Please select the best answer from the choices provided.
A
B
C
D
Answer:
A. the further the yardsticks falls, the slower the reaction time.
Answer:
The further the yardstick falls, the slower the reaction time.
Explanation:
its A
30 POINTS!!!! If you increase the frequency, what happens to the velocity of the wave?
In answering this question, describe how you determined the velocity as well as the result you arrived at. Then, provide a scientific explanation for this result, based on your knowledge of waves.
Answer:
As frequency increases, wavelength decreases. Frequency and wavelength are inversely proportional. This basically means that when the wavelength is increased, the frequency decreases and vice versa.
Explanation:
A wave's velocity is independent of its intensity and equal to the product of its wavelength and frequency (number of vibrations per second) so, velocity remains constant if you increase the frequency.
What is Frequency?Frequency is defined as the no of waves that are passing from the point in respect to a given time. Frequency can be measured in Hertz. Humans, whose capacity to hear is normal, can hear between the frequency of 20 Hertz to 20000 Hertz.
In mathematical form, the frequency is the factor of one divided by the time period. The number of cycles or vibrations a body in periodic motion makes in one unit of time.
Wavelength reduces as frequency rises. The relationship between frequency and wavelength is inverse. In essence, this means that the frequency reduces as the wavelength increases and vice versa.
Frequency ∝ 1 / Wavelength
Velocity = Frequency × Wavelength
Thus, it remains constant.
To know more about frequency:
https://brainly.com/question/14316711
#SPJ2
it takes 5100 N of force to accelerate a ford mustang 3 m/s2 what is the mass of the car
Answer:
1700 kg
Explanation:
The mass of the ford mustang car be 1700 kg.
What is mass?In physics, mass is a quantitative measurement of inertia, a basic characteristic of all matter. It essentially refers to a body of matter's resistance to changing its speed or location in response to the application of a force.
The change caused by an applied force is smaller the more mass a body has. The kilograms serves as the unit of mass in the International System of Units (SI).
Given parameters:
Force applied on the ford mustang car: F = 5100 N.
Acceleration of the ford mustang car: a = 3 m/s^2.
So, The mass of the ford mustang car be = force/acceleration
= 5100/3 kg.
= 1700 kg.
Hence, the mass of the ford mustang car be 1700 kg.
Learn more about mass here:
https://brainly.com/question/19694949
#SPJ2
Sharon is driving on a straight road. She is driving north, and her speed is
decreasing. If north is the positive direction, which of the following
statements is accurate?
A) Her velocity is positive, and her acceleration is negative.
B) Her velocity is negative, and
her acceleration is negative.
C) Her velocity is negative, and her acceleration is positive.
D) Her velocity is positive, and her acceleration is positive.
Plzz help
Answer:
b
Explanation:
b is the correct answer
Answer:
b. Her velocity is positive, and her acceleration is negative.
Explanation:
2. The purpose of using ice on an injured area is... *
to increase blood flow.
O to hydrate an injury.
O to reduce blood flow.
O to dilate blood vessels.
Who else got stuck on a question and is NOT ready for test return at 2? its 1:58 AAAAAAA
If you can run at a speed of 30 miles per hour and run a distance of 15
miles, how long did it take you to run that distance?
Answer:
30 mins
Explanation:
speee=distance/time
300m/h=15m/time
time=15miles/300miles/hous=1/2 hours=30 mins
Answer:
30 minutes.
Explanation:
If it takes you an hour to run 30 miles but you only need to run 15 miles then you split that hour in half, which results in half an hour or 30 minutes.
The temp of the metal in a running car engine is 388 K. Find this temp in Celsius.
Answer:
115°c
Explanation:
°c=k-273
388-273=115
Chemical reactions occur due to sharing or transferring of blank. Please help ASAP!!!!
Answer: valence electrons?
Explanation:
The density of an object is dependent upon the object’s mass and ---
Answer:Volume
Explanation:
Density = mass/ Volume
Answer:
Volume
Explanation:
A car decelerates uniformly from 54 m/s to 38 m/s in 8.0 seconds. How far does it travel dunng this time?
Answer:
368m
Explanation:
dx=vt
54+38/2=46
46*8=368m
Please help
A 2000 kg car is moving at 1.5 m/s. What is its kinetic energy?*
A. 0J
B. 3000J
C. 1500 J
D. 4500 J
E. 2250 J
100 points if u help me and get it right this needs to be done in 3 min hurry to get ur 100 points
Calculate the kinetic energy of a 50 kg cart moving at a speed of 6.9 m/s.
Answer:
35
Explanation:
c7z ya boiiiiiiiiiiiiiiiiii
If you increase the frequency what happens to the distance between the waves (wavelength)?
The size of the waves stays the same
the distance increases (longer wavelength)
There is no way to tell.
the distance decreases (shorter wavelength)
Answer:
C)the distance decreases Shorter wavelength
Step by step Explanation:
Atoms of two different elements must have different
A. Electrical charges
B. Number of neutrons
C. Atomic numbers
D. Energy levels
Explanation:
C. Atomic numbers....
Answer:
atomic numbers
Explanation:
In order for two atoms to be different, they have to have a different number of protons. Protons are represented by the atomic number. Thus, atoms of two DIFFERENT elements must have different atomic numbers.
I took the test and got 100%
Hope this helps!
What is power??????????
Two physics students, Ben and Bonnie, are in the weightlifting room. Bonnie lifts the 50 kg barbell over her head (approximately .60 m) 10 times in one minute; Ben lifts the 50 kg barbell the same distance over his head 10 times in 10 seconds. Which student does the most work? Which student delivers the most power? Explain your answers.
Answer:
Both of them
Explanation:
An outfielder throws a baseball to the second baseman at a speed of 19.6 m/s and and angle of 60 degrees above the horizontal. If the ball is caught at the same height from which it was thrown, calculate the amount of time the ball was in the air
how do you know the pole on the left is the south pole and the pole on the right is the north pole?
Answer:
Left is deciamled to the right [tex]x_{123}[/tex]
Explanation:
which option lists materials in order by their ability to allow the flow of electrons, from most easily to least easily?
A. Conductor, semiconductor, insulator
B. Semiconductor, insulator, conductor
C. Insulator, semiconductor, conductor
D. Semiconductor, conductor, insulator
Help me pls!
Answer: Conductor, semiconductor, insulator
Explanation:
Just did the quiz
The correct option is option A.
The descending order in which electrons flow easily is:
Conductor, semiconductor, insulator
Conductivity and flow of electrons:The correct order for materials by their ability to allow the flow of electrons, from most easily to least easily is Conductor, semiconductor, insulator.
Conductors are generally metals, they have plenty of free electrons due to which the electron flow is easy. Also, the conduction band and valance band in a conductor overlap, so they can conduct at room temperature.
In the case of semiconductors, the band gap between the conduction band and valance band is almost 1eV, so a little energy is enough to make the flow of electrons possible
Whereas, in insulators, the band gap is quite high and electrons can not jump from the conduction band to the valence band due to which the flow of electrons is not possible.
Learn more about band gap:
https://brainly.com/question/14124478?referrer=searchResults
Kayla is measuring how long it takes a ball to roll down a hill. The ball has a
starting velocity of 2.6 m/s. The ball rolls down the hill for 5.5 seconds, and
when it reaches the bottom, it has a velocity of 8.0 m/s. How far did the ball
roll during this time frame?
A) 44 meters
B) 14 meters
C) 29 meters
D) 58 meters
An electric energy distributor supplies each household 220
volts of voltage and 60 A of current. Applying your knowledge on Ohm's Law, in what way your appliances be used at home to maintain a safe amount of current?
Answer:
Hence appliance but be connected to a 3.67 ohms load to maintain a safe amount of the current
Explanation:
According to Ohm's law, V = IR
V is the potential difference = 220volts
I is the current = 60 A
R is the resistance (Load)
Calculating the load R
R = V/I
R = 220/60
R = 3.67 ohms
Hence appliance but be connected to a 3.67 ohms load to maintain a safe amount of the current