Answer:
C. reflection
Explanation:
reflection occurs when a wave strikes an object and bounces off of it
When a wave strikes an object and bounces off, it is called reflection.
Hence, the correct option is C.
This is similar to what happens when sound waves strike a surface and bounce back, resulting in an echo.
Reflection occurs when a wave encounters a boundary or an obstacle and changes direction, returning back into the medium it came from.
The angle of incidence (the angle at which the wave strikes the surface) is equal to the angle of reflection (the angle at which the wave bounces off the surface).
Therefore, When a wave strikes an object and bounces off, it is called reflection.
Hence, the correct option is C.
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density of iron is 8000kg/m cube .calculate the mass of iron is 8000kg/m cube .calculate the mass of iron contained by 5m cube of iron block
answer:
40,000 kg
explanation:density=mass/volume
then mass=density×volume
= 8000× 5
=40,000 kg
Water exists as ice, water or steam. (a) Complete the sentences. Choose the answers from the box. ice steam water The particles are arranged in a regular pattern in ____________________ . The particles are close together but not in a pattern in ____________________ . The particles move quickly in all directions in ____________________ .
Explanation:
The options are; Ice Steam and Water.
The state of matter associated with the options are;
Ice - Solid
Steam - Gas
Water- Liquid
The particles are arranged in a regular pattern in ____________________
Among all the state of matter, the particles are closely packed and in an ordered manner is observed in the solid state - Ice
The particles are close together but not in a pattern in ____________________
In the liquid state of matter, the particles are not as tightly bounded as that of the solid. Hence they are able to still move around a bit. - Water
The particles move quickly in all directions in ____________________
The particles of the gaseous state move in all directions colliding with each other and the walls of the container. - Steam
what is the moment produced by 15n force ?
Answer:
12mA
Explanation:
If an object has zero acceleration, does that mean that its velocity is zero? Give an example.
Answer:
Yes, an object that was set in motion in the past by some force, but that is no longer being acted on by a net force, is moving but with zero acceleration, i.e. it is moving at constant velocity. For example, a puck sliding along a horizontal plane of ice after being hit with a hockey stick.
Weight is the downward pull of
on mass. What one word completes the sentence?
The word "gravity" belongs between "of" and "on".
An ice cream maker has a refrigeration unit which can remove heat at 120 Js'. Liquid ice
cream, of mass 0.6kg at a temperature of 20 °C, is added to the container.
container
refrigeration
unit
(a) Calculate how much energy must be removed from the mixture to cool it to its
freezing point of -16°C.
(Specific heat capacity of ice cream = 2100 J kg 1 °C')
Answer:
The amount of heat energy that must be removed from the mixture to cool it to its freezing point, of -16°C is 45,360 J
Explanation:
The given parameters for the refrigeration unit and the ice cream are;
The power of the refrigeration unit = 120 J/s
The mass of the liquid ice cream, m = 0.6 kg
The initial temperature of the liquid ice cream, T₁ = 20°C
The freezing point temperature of the ice cream, T₂ = -16°C
The specific heat capacity of the ice cream, c = 2,100 J/kg⁻¹·°C⁻¹
The amount of heat energy that must be removed from the mixture to cool it to its freezing point, ΔQ, is given as follows;
ΔQ = m × c × ΔT
Where;
ΔT = T₁ - T₂
∴ ΔQ = m × c × (T₁ - T₂)
Therefore, by substituting the known values, we have;
ΔQ = 0.6 × 2,100 × (20 - (-16)) = 45,360
The amount of heat energy that must be removed from the mixture to cool it to its freezing point, of -16°C = ΔQ = 45,360 J.
A pirate’s map has you traveling 8 m N and 10 m W. It takes you 22 seconds to complete the distance. What is your speed?
a.) What happens when a force is applied to an atom? b.) What is this called?
Answer:
it binds the negatively charged electrons to the positively charged atomic nucleus.
Explanation:
its called Electromagnetic Force
Convert 1 second into solar day.
DIVIDE 1 BY 86400 TO CONVERT 1 SECOND INTO SOLAR DAY.
What is the average velocity of the car over the first 0.25m? ___m/s
What is the average velocity of the car over the second 0.25m? ___m/s
Answer:
first one : 0.11
second one : 0.28
Explanation:
I took the test and got it right!!!!!
I’ll literlly give you points
and make you brainiest
Answer:
a
Explanation:
During a spring tide, the high tides are very high and the low tides are very low. Why does this occur?
Image result for During a spring tide, the high tides are very high and the low tides are very low. Why does this occur?
In both cases, the gravitational pull of the sun is 'added' to the gravitational pull of the moon on Earth, causing the oceans to bulge a bit more than usual. This means that high tides are higher and low tides are lower than average. These are called 'spring tides. '
brainliest please?
Answer:
In both cases, the gravitational pull of the sun is 'added' to the gravitational pull of the moon on Earth, causing the oceans to bulge a bit more than usual. This means that high tides are higher and low tides are lower than average. These are called 'spring tides. '
HELP PLS !!!!!!!!!!!!!
Explanation:
Weight on Earth = 784N.
Mass of Person = 784N / (9.81N/kg) = 79.9kg.
Weight on Moon = (79.9kg)(1.60N/kg) = 128N. (3s.f.)
I have the answer I just need it worked out, thank you.
A dry cleaner throws a 22 kg bag of laundry onto a stationary 9 kg cart. The cart and bag begin moving at 3 m/s to the right. Find the velocity of the bag before the collision. (4.2 m/s)
Answer:
Vbag = 4.22 [m/s]
Explanation:
In order to solve this problem we must use the principle of conservation of momentum. Which tells us that the momentum of a system is preserved before and after a collision.
Let's take both movements (bag and cart) as positive, since they both move in the same direction. Now everything that happens before the collision will be taken to the left of the equation and after the collision to the right of the equal sign.
[tex](m_{bag}*v_{bag})=(m_{bag}+m_{cart})*v_{final}[/tex]
where:
mbag = mass of the bag = 22 [kg]
vbag = velocity of the bag [m/s]
mcart = mass of the cart = 9 [kg]
vfinal = mass of both bodies moving together = 3 [m/s]
Now replacing:
[tex](22*v_{bag})=(22+9)*3\\22*v_{bag}=93\\v_{bag}=4.22[m/s][/tex]
EM waves consist of changing electric and magnetic fields moving perpendicular with respect to each other. What kind of wave is it?
-Transverse waves
-Longitudinal waves
-Mechanical waves
-Compressional waves
Answer:
Transverse
Explanation:
Electromagnetic waves don't depend on the medium they travel through like a mechanical wave does, so they aren't mechanical. They don't oscillate (move back in forth) in the direction they travel either, ruling out compressional and longitudinal waves.
That leaves tranverse waves, the ones we're most used to, since they look very "wavelike," with smooth peaks and valleys. Electromagnic waves behave like these, oscillating in a plane perpendicular to the direction they're traveling in.
An object that is falling through the air will feel"weightless because:
Answer: its B
Explanation:
If the orbital velocity of a satellite is 2 rad/s then what will be the period of satellite.
Select one:
a. 2 sec
b. 3.14 sec
c. 6 sec
d. 8 sec
Answer:
Using the orbital velocity as deg/time or the angular speed:
1 rev / sec = 2 * pi rad / sec since there are 2 pi rad in a revolution
2 rad/sec = 1 / pi rev/sec = f from above
P = 1 / f = pi sec/rev = 3.14 sec/rev
Most of the lactic acid produced by anaerobic respiration in muscle fibers is reconverted to glucose in the?
Answer
liver
Explanation:
Once sufficient oxygen is restored, the lactic acid produced via anaerobic glycolysis can be utilized for energy or reconverted into glucose by the liver and other tissues (a process known as oxidation).
4. When a ray of light is incident at a critical angle in denser medium, the angle
of refraction in rarer medium is
A 0°
B 45°
C 90°
D 180°
Answer:
C. 90°
Explanation:
The critical angle is that angle of incidence in the dense medium where the angle of refraction is 90°.
In this case, light travels from the more optically dense medium to the less optically dense medium.
When the angle of incidence in the dense medium is equal to the critical angle, the angle of refraction is 90°.
The maximum displacement of an oscillatory motion is A=0.49m. Determine the position x at which the kinetic energy of the particle is half it's elastic potential energy
Answer:
The position x, is ± 0.4 m.
Explanation:
The total mechanical energy of the oscillatory motion is given as;
[tex]E_T = U +K.E\\\\E_T = \frac{1}{2} kA^2\\\\ \frac{1}{2} kA^2 = U +K.E\\\\K.E = \frac{1}{2} kA^2 - U ----equation(1)[/tex]
When the kinetic energy (E) is half of the elastic potential energy (U);
[tex]K.E = \frac{U}{2} ----equation(2)[/tex]
Equate (1) and (2)
[tex]\frac{U}{2} = \frac{1}{2} kA^2 - U\\\\U = kA^2 -2U\\\\U+2U = kA^2\\\\3 U = kA^2\\\\3(\frac{1}{2} kx^2) = kA^2\\\\\frac{3}{2} x^2=A^2\\\\x^2 = \frac{2}{3} A^2\\\\x = \sqrt{\frac{2}{3} A^2} \\\\x = A\sqrt{\frac{2}{3} } \\\\x = 0.49\sqrt{\frac{2}{3} }\\\\x = + /- (0.4 \ m)[/tex]
Thus, the position x, is ± 0.4 m.
Look at the pic please
Answer:
your answer is B) i hope this helps you and have a good day.When two objects interact they exert forces on each other. Will these forces act in the same direction or in opposite directions?
When two objects interact, they exert forces on each other. These forces act in opposite directions.
What is Newton's third law of motion?According to Newton's third law of motion, every action has an equal and opposite reaction. As well as, the action and reaction are always acted in pairs.
When two things collide, they exert forces on one another. These forces have opposing effects.
When two objects interact, they exert forces on each other. These forces act in opposite directions.
Hence,these forces act in opposite directions.
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describe the movement of a transverse wave please i will give brainliest and the max points
Answer: Movement in which all positions of both the waves rotate around the directions at right angles to the axis of the wave's movement.
Explanation: Hope this help
which statement describes the effects of forces on an object
Answer:
Sorry this isn’t going to be any help. You don’t have any statement that I’m able to see.
Explanation:
According to the law of conservation of energy, which changes would
increase the total energy of a system?
A. An addition of 400 J of GPE and a loss of 250 J of thermal energy
B. An addition of 100 J of thermal energy and a loss of 450 J of
kinetic energy
C. An addition of 200 J of kinetic energy and a loss of 250 J of
thermal energy
D. An addition of 300 J of thermal energy and a loss of 450 J of
kinetic energy
Answer:
Correct option is (a)
Explanation:
According to conservation of energy: Total energy of system remains conserved or we can say total energy = constant
(a) 400J of GPE is added and 250J of thermal energy is lost
⇒ Total energy = 400-250 J = 150 J
hence, 150J energy is increased
(b) 100J of thermal energy is added and 450J of kinetic energy is lost
⇒ Total energy = 100-450 J = -350 J
hence, 350J energy is decreased or lost by system
(c)200J of kinetic energy is added and 250J of thermal energy is lost
⇒ Total energy = 200-250 J = -50 J
hence, 50J energy is decreased or lost by system
(d)300J of thermal energy is added and 450J of kinetic energy is lost
⇒ Total energy = 300-450 J = -150 J
hence, 150J energy is decreased or lost by system
Therefore, correct option is (a)
Explanation:
According to conservation of energy: Total energy of system remains conserved or we can say total energy = constant
(a) 400J of GPE is added and 250J of thermal energy is lost
⇒ Total energy = 400-250 J = 150 J
hence, 150J energy is increased
(b) 100J of thermal energy is added and 450J of kinetic energy is lost
⇒ Total energy = 100-450 J = -350 J
hence, 350J energy is decreased or lost by system
(c)200J of kinetic energy is added and 250J of thermal energy is lost
⇒ Total energy = 200-250 J = -50 J
hence, 50J energy is decreased or lost by system
(d)300J of thermal energy is added and 450J of kinetic energy is lost
⇒ Total energy = 300-450 J = -150 J
hence, 150J energy is decreased or lost by system
Therefore, correct option is (a)
PLEASE HELP Due Soon!
What are two examples of chemical energy being transformed?
Answer:
Hope I can help you.
Explanation:
Here u go here are some that you can choose from! :)
1) Air bags are activated by a chemical reaction inside the bag. A sensor turns on an electrical circuit, and then sodium azide is ignited. The reaction that occurs generates nitrogen gas, which fills the bag at an extremely rapid rate.
2) Baking soda and vinegar produce carbon dioxide gas when mixed. As this gas grows in volume, it puts pressure on whatever container it is in, and will erupt out of an opening in the container, creating a volcano effect. This chemical reaction is safe, making it a great science activity for kids.
3) Batteries have two terminals: the anode and the cathode. They're separated by an electrolyte, a chemical that allows the anode and cathode to transmit a charge. When something's connected to a battery, chemical reactions take place along the electrodes to produce electricity. Of course, you can't see the energy in the battery when the battery is just sitting around; it is when the electricity is produced that the energy is seen.
4) Explosives: when an explosive goes off, chemical energy that was stored in it is changed and transferred into sound energy, kinetic energy, and thermal energy. Just because chemical energy is being released, it doesn't mean an explosion will occur. But, when a solid material quickly changes into a hot, expanding gas, you may be looking at an explosion. Take TNT, for example. Two units of solid TNT can instantly change into 15 units of hot gas, creating a dark and sooty explosion.
5) Food: chemical energy in food is released when the food is digested and the molecules of food are broken down into smaller pieces. Our bodies digest food by mixing it with acids and enzymes in the stomach. This process turns carbohydrates into glucose. The stomach (and small intestine) then release that glucose into the bloodstream, serving as energy for our bodies.
6) Heating packs (used to warm up cold hands or soothe sore muscles) have chemicals inside them. A lot of them function by "cracking" (or bending) them. This is because they're filled with iron. Once you crack the heating pack, the iron is exposed to the air. As the iron reacts to the oxygen, it transforms into iron oxide, a chemical that can produce heat.
7) Wood, when dry, stores chemical energy. This chemical energy is released as the wood burns, and it is converted into heat, or thermal energy. This also produces light energy. As a result of burning, the wood turns into an entirely new substance - ashes.
Special ways that animals' bodies work to help them survive in whatev
condition they're in, such as camels in the desert conserving water and
able to go days without drinking is what type of adaptation? *
Answer:
Physiological – special ways that animals' bodies work to help them survive in whatever condition they're in, such as camels in the desert conserving water and being able to go days without drinking.
Explanation:
WILL MARK BRAINLIEST PLEASE HELP AND SHOW ALL WORK
Consider the system shown in FIGURE 9-35. Assume that after the string breaks the ball falls through the liquid with constant speed. If the mass of the bucket and the liquid is 1.20 kg, and the mass of the ball is 0.150 kg, what is the reading on the scale (a) Before (b) After the string breaks?
a. 13.23 N
b. 13.2
What you need to do is use this equation:
(m1 + m2) x g
hope it helps!
Two objects are dropped in vacuum chamber from the same height: a marble and a bowling ball. Which of the following are true? (Mark two answers)
The bowling ball will accelerate faster
After 1 second both objects will have the same acceleration
In a vacuum objects can't move
Both objects will reach the ground at the same speed
The marble will remain in the air longer
Answer:
After one second both objects will have the same acceleration
Both objects will reach the ground at the same speed
Explanation:
Because a vaccum chamber is a free fall place
How much thermal energy is absorbed by
1.00X102 g of ice at -20.0°C to become
water at 0.0°C?
Answer:
4202.4 J
Explanation:
The formula for calculating the heat absorbed by ice to melt into water is given by :
ΔH = Cp × m × Δ T -------where ;
Cp =specific heat of ice = 2.06 J/g° C
m= mass of ice = 102 g
ΔT = 0°C--20°C = 20°C
Thermal energy absorbed by the ice will be;
ΔH = Cp × m × Δ T
ΔH = 2.06 * 102 * 20
ΔH =4202.4 J