Answer:
D
Explanation:
since we press the key , air molecules ate presented and sound wave is formed what we hear.
Answer:
B
Explanation:
the vibrating string of pianoCold packs are designed to become very cold when activated. When the pack is activated, a chemical reaction occurs to make the temperature of the cold pack decrease. What must be true of this chemical reaction? (2 points) The reaction releases energy to its surroundings. The reaction releases energy to its surroundings. The products and reactants have the same amount of energy. The products and reactants have the same amount of energy. The products have less energy than the reactants. The products have less energy than the reactants. The reaction absorbs energy from its surroundings.
Answer:
The reaction absorbs energy from its surroundings.
Explanation:
An endothermic reaction is any reaction in which energy is absorbed by the reaction system.Thus implies that energy is withdrawn from the environment A cold pack's function is based on an endothermic chemical reaction.
The absorption of energy by the reaction system means that the environment feels cool in an endothermic reaction.This manifests in a decrease in the temperature of the cold pack.
define gravitational field intensity?
Explanation:
The strength of the gravitational field is known as gravitational field intensity. It is the gravitational force acting on a unit test mass.
What is an important difference between nanotechnology and microtechnology?
Nanotechnology shows results of quantum mechanics, but microtechnology does not.
Microtechnology shows results of quantum mechanics, but nanotechnology does not.
Microtechnology is used to make products, but nanotechnology is not.
Nanotechnology is used to make products, but microtechnology is not.
Answer:
A) Nanotechnology shows results of quantum mechanics, but microtechnology does not.
Explanation:
Edge 21 test
The difference between nanotechnology and micro technology is nanotechnology shows results of quantum mechanics, but micro technology does not.
What are the differences between micro-technology and nanotechnology?Micro technology:
The technology that can be featured completely in a microscopic scale is known to be micro - technology. This technology that contribute to design, use components, devices that involves in small size. These were done significantly in smaller features.
Nanotechnology:
Nanotechnology is the field of applied science and technology that can be measured through nanoscale. Nanotechnology is helping to considerably improve, industry sectors - information technology, homeland security, medicine, transportation, energy, food safety, and environmental science, among many others.
Thus, Nanotechnology shows results of quantum mechanics but micro-technology does not. Option A is the correct answer.
Learn more about micro and nano technology,
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A 20×10⁹charge is moved between two points A andB that are 30mm apart and have an electric potential difference of 600v between them. calculate a) the electric field strength between A and B b)the work done on the charge.
Answer:
John Felix Anthony Cena is an American professional wrestler, actor, and television presenter. He is currently signed to WWE. Born and raised in West Newbury, Massachusetts, Cena moved to California in 1998 to pursue a career as a bodybuilder.
Explanation:
Elena puts her eggs in a cage made out of wood. The wood breaks during
the landing, but the eggs survive. Which would be the best reason to
explain why this prevented her eggs from breaking?"
O Directs the energy of the impact towards the egg
O Decreases the velocity of the egg before it starts slowing down
O Increases the time that the egg slows down
O Decreases the time that the egg slows down.
O Directs the energy of the impact away from the egg
O Increases the velocity of the egg before it starts slowing down
Answer:
I think the answer is Decreases the time that the egg slows down.
Explanation:
If not try it starts slowing down
O Increases the time that the egg slows down.
Two bears sit on a see-saw. The see-saw is 3.5 m in total
length with the fulcrum at the center. A 40 kg baby bear sits at the very end of one side. Where should the 120 kg father bear sit relative to the center to keep the see-saw balanced?
Answer:
Explanation:
For the see-saw to be balanced, take moment at the fulcrum:
40g * 3.5/2 = 120g * distance
distance = 1.167m from the center
A student is holding a marble in his hand. What are the equal and opposite forces that are acting on it?
Answer:
Gravity and his hand
Explanation:
A device used to measure small currents is a(n)
a.
electric motor.
b.
commutator.
c.
armature.
d.
galvanometer.
Answer:
d.
galvanometer.
Explanation:
Galvanometer is the device which is used for measuring small currents due to changing magnetic field.
Below is a single of DNA, What is the complementary base pair for RNA?
AGC, CGT, ATA, GAT
explain why does the bowling ball decelerate as it travels along the lane
The main cause of this is Friction. The more oil that is laid down, the less friction there is between the ball and the lane surface. The less friction, the harder it is for the bowler to send the ball in a curved path imparted by the spin that the bowler puts on the ball at the instant of release.
A 100kg linebacker runs with a velocity of 5m/s towards an 88kg quarterback, who begins to back up
with a velocity of 2m/s to avoid being sacked
a.What is the momentum of the linebacker-quarterback system?
b.the quarterback is unsuccessful in evading the linebacker and gets sacked. what is the velocity of the football players just after the linebacker dives in for a tackle if the 2 players move as one clump?
can someone help me pls
Answer: food, female water
Explanation:
Can I have brainliest
Answer : dog horse cat lion deer moose tiger cheetah hippopotamus zebra rabbit penguin dolphin shark fish
Explanation:
What is the direction of the force on a positive charge when passing through a magnetic field as indicated in this diagram? Explain how you got
your answer.
Answer:
The direction of the magnetic force on a moving charge is perpendicular to the plane formed by v and B and follows right hand rule–1 (RHR-1)
Explanation:
hope this helps
Answer:
The direction is into the page. Your thumb is along the velocity vector and your fingers travel along the magnetic-field vector to leave your palm moving into the page
Explanation:
Plato
Below is a single strand of DNA, what is the complementary base pair for the strand?
AAG, GCA, TCA, GAT
No matter how well we get along with our parents as adolescents, there comes a time when we need to break away and assert our own independence. There are several ways in which we do this, some of them deliberate and intentional and some of them not so intentional. Describe several ways you use or have used to break away from your parents. Briefly describe your parents' reactions.
Answer: I never said anything to them but if i did it would be "I need a break from you, i love you but sometimes I have to find the path on my own." i would say this if i wasn't scared to hurt them.
Explanation:
Every second, the Sun converts about 600 million tons of hydrogen into 596 million tons of helium. The remaining 4 million tons of mass is Every second, the Sun converts about 600 million tons of hydrogen into 596 million tons of helium. The remaining 4 million tons of mass is converted to an amount of energy equal to 4 million tons times the speed of light cubed. converted to an amount of energy equal to 4 million tons times the speed of light. reabsorbed as molecular hydrogen. converted to an amount of energy equal to 4 million tons times the speed of light squared. ejected into space in a solar wind.
Answer:
Converted to an amount of energy equal to 4 million tons times the speed of light squared. ejected into space in a solar wind.
Explanation:
The 4 million tons of mass is converted to the amount of energy that is equal to 4 million tons times the speed of light squared. This energy moves from the sun with the help of solar winds and received by the planets present in the solar system. This solar energy moves in the form of solar radiation because there is no medium for propagation so that's why we can say that the mass is converted into energy that moves in the form of radiation in discrete packets.
A body is thrown up with with velocity u.it reaches maximum height h. If velocity of projection is doubled the maximum height is..
Answer: 4h
Explanation:
Given
The body is thrown vertically upward with velocity u and reaches a height of h
The relation between u and h is given by
[tex]\Rightarrow v^2-u^2=2as\\[/tex]
Put [tex]v=0,a=-g[/tex] in above equation
[tex]\Rightarrow 0-u^2=2(-g)h\\\\\Rightarrow h=\dfrac{u^2}{2g}[/tex]
If the velocity of projection is doubled i.e. 2u
[tex]\Rightarrow h'=\dfrac{(2u)^2}{2g}\\\Rightarrow h'=4\times \dfrac{u^2}{2g}\\\\\Rightarrow h'=4h[/tex]
The maximum height becomes 4h
(b) The cylinder shown in figure 2 is fitted with a freely sliding piston containing an ideal gas of mass 13g and volume 1.0×10⁴ cm⁵ . The tempreture of the gas is 25°C and it is initially at atmospheric pressure.
(i) The gas is heated to a Tempreture of 400°C . what is the new volume of the gas?
Answer:
22600 cm³ (3 s.f.)
Explanation:
Please see the attached picture for the full solution.
Which of the following is most likely to happen when a sound wave reflects
off a hard surface? (Assume that neither the source of the sound nor the hard
surface is moving.)
A. A beat frequency
B. An echo
O C. A change in speed
O D. A change in pitch
SUBMIT
Answer:
B. An echo
Explanation:
An echo is the sound heard after the reflection of sound waves from a hard surface. It has both advantages and disadvantages with respect to its applications.
Some of it applications include;
i. it can be used to determine the depth of the sea
ii. it can be used in crude oil exploration
iii. it can be used to determine the speed of sound in air
An echo is different to reverberation of sound.
What is the electric field strenght in units of N/C if the flux through a 2.0m by 1.0m rectangular surface is 396Nm2/C, if the electric field is uniform, and if the plane of the surface is at an angle of π/3 radians with respect to the direction of the field ?
Answer:
The appropriate answer is "396 N/C".
Explanation:
The give values are:
Rectangular surface,
[tex]\Phi_e=396 \ N.m^2/C[/tex]
[tex]a = 2 \ m[/tex]
[tex]b = 1 \ m[/tex]
Angle,
[tex]\theta =\frac{\pi}{3} \ radian[/tex]
Now,
The area of rectangle (A) will be:
= [tex]a\times b[/tex]
= [tex]2\times 1[/tex]
= [tex]2 \ m^2[/tex]
hence,
The electric field strength will be:
⇒ [tex]\Phi_e=E.A Cos \theta[/tex]
or,
⇒ [tex]E=\frac{\Phi_e}{ACos \theta}[/tex]
On putting the given values, we get
⇒ [tex]=\frac{396}{2\times Cos(\frac{\pi}{3} )}[/tex]
⇒ [tex]=\frac{396}{2\times 0.5}[/tex]
⇒ [tex]=\frac{396}{1}[/tex]
⇒ [tex]=396 \ N/C[/tex]
A wave is moving at the rate of 40 cm/s. Its wavelength is 5 cm. What is the frequency of the wave? INCLUDE THE CORRECT UNIT!
Answer:
Solution given:
velocity=40cm/s
wave length=5cm
we have
frequency =velocity/wavelength=40/5=8hertz.
the frequency of the wave is 8 hertz.
Which of these terms means an object's resistance to changing its motion?
Question 1 options:
inertia
velocity
newton
power
Question 2 (1 point)
Which of these equations is a representation of the 2nd Law of Motion?
Question 2 options:
v=d/t
W=Fd
F=ma
a=v/t
Question 3 (1 point)
Which words correctly complete the 3rd Law of Motion?
For every ___________ there is an equal and opposite ___________.
Question 3 options:
cause, effect
action, reaction
distance, velocity
cost, benefit
Question 4 (1 point)
Which of these could be a force that changes the motion of an object?
Question 4 options:
friction
a push or pull
air resistance
all of the above
Question 5 (1 point)
According to the second law of motion, which statement is TRUE?
Question 5 options:
every action has a reaction
a heavy object requires more force to push than a lighter object
an object at rest, stays at rest
heavy objects accelerate faster than lighter elements with the same force
Answer:
Inertia
F=ma
Action, reaction
All of the above
A heavy object requires more force to push than a lighter object.
what is kinetic energy, in your own words but be more detailed about what you say.
Kinetic energy is the energy when a object is in motion. ... energy gets transferred to the object, The energy transferred is kinetic energy, and it depends on the mass and speed.
Explanation:
The water hyacinth lives in lakes and ponds it forms large floating mats of plants because it does not root in soil which adaptation lets it get nutrients directly from the water is it A.1 curly leaves B.Trailing C.Sturdy stems D. Upright flowers
Answer:
C. Sturdy stems
Explanation:
Sturdy stems is the adaptation that enables water hyacinth to get nutrients directly from the water because there is no roots are present for the absorption of nutrients from water. The hollow bulbous stem below each leaf of water hyacinth allows the plant to get nutrients from the water. This hollow bulbous stem allow the plants to float on the water surface, keeping the leaves and flowers above the water so they don't rot.
Between which of the following surfaces would the force of friction be
greatest?
A. Rubber shoe soles on artificial turf
B. Rubber shoe soles on ice
C. Rubber shoe soles on asphalt
D. Rubber shoe soles on wet grass
A person can lands safely on the surface of the earth but not moon. why?
Answer:
The gravitational force on the moon is less than on Earth, because the strength of gravity is determined by an objects' mass. The bigger the object, the bigger the gravitational force. Gravity is pretty much everywhere
Explanation:
Why might astronauts choose to “lope” or hop rather than walking or running on the moon? Astronauts can “lope” in the moon's low gravity levels, even though this gait pattern is very difficult to use on Earth.
who is the richest artist in the Gambia 2020
Answer:
Jaliba Kuyateh is the most famous and wealthiest Gambian musician.
What causes mechanical wave motion
Answer:
A disturbance or vibration in matter
Explanation:
Answer:
A mechanical wave is a distance in matter that transfer energy through the matter. A mechanical wave starts when matter is disturbed. A source of energy is needed to disturb matter and start a mechanical wave.
Which type of uninterruptible power supply uses AC power to continuously charge its battery, while also providing power to devices through the battery?
Answer:
An online UPS.
Explanation:
An online UPS is a type of uninterruptible power supply uses AC power to continuously charge its battery, while also providing power to devices through the battery. It combines the inverter and rectifier to provide power to the alternating current (AC) load while supplying alternating current (AC) power during an outage to the load through the inverter.
Basically, an uninterruptible power supply unit is used to provide constant power supply to an electrical device, especially during a power outage.
True or False: A higher vapor pressure (evaporates easily) corresponds to strong intermolecular forces. (dont answer)
anyways free p o i n ts...
Answer:
truuuuuuuuuuuuuuuuuuuuuuuuujuuuuuuuur
Answer:
true
Explanation:
I took a test this year and I know the answer