Explanation:
Wavelength = speed of light/frequency
Answer is
[tex]6 \times {10}^{ - 7} [/tex]
Which are electromagnetic waves? Check all that apply.
earthquake waves
infrared waves
ocean waves
radio waves
ultraviolet waves
Answer:
infrared waves
radio waves
ultraviolet waves
Explanation:
Radio waves are used for communication such as television and radio.
Infrared light is used by electrical heaters, cookers for cooking food, and by infrared cameras which detect people in the dark.
Ultraviolet radiation can kill bacteria that are present in water - this sterilises the water and makes it safe to drink.
Answer:
infrared waves
radio waves
ultraviolet waves
Explanation:
Radio waves are used for communication such as television and radio.
Infrared light is used by electrical heaters, cookers for cooking food, and by infrared cameras which detect people in the dark.
Ultraviolet radiation can kill bacteria that are present in water - this sterilises the water and makes it safe to drink.
Why was John Paul Jones's victory important in the war? His victory increased France's confidence in the skill of the Continental navy. His victory against a large warship dealt a blow to the Spanish navy. His victory against a superior British foe inspired the American troops.
Answer:
C. His victory against a superior British foe inspired the American troops.
Explanation:
John Paul Jones is considered the hero in the Revolutionary War. He is known as the Father of the US Navy.
In the Revolutionary War, Jones sided with the American colonists against the British and took hold of naval ships. In 1779, when the British warship Serapis was in conflict with the American warship Bon Homme Richard, Jones plugged the American warship with the Britisher's warship and tossed a grenade into the opponent warship. Thus when Jones was victorious in the war, this boosted the American spirits for the war.
Therefore, option C is the correct answer.
Answer:
c
Explanation:
20 points**plz help
Explain the effect of increasing the number or size of the magnets on the speed of a motor.
Explanation:
the speed of the motor can be increased by increasing the strength magnetic field increasing the current flowing through the coil.
Insect A moves 5.0 m/min and insect B moves
9.0 cm/s. Determine which insect is ahead
and by how much after 30 min. Assume both
insects are moving in the same direction.
Answer:
insect B by 12m
Explanation:
30min = 1800s (times by 60)
5m/min x 30min = 150m
9cm/s x 1800s = 16,200cm = 162m
162m - 150m = 12m
a man shoveling snow clears his front step using 200 joules in 100 seconds, how much power did he use
2 watts
20,000 watts
100 watts
300 watts
Answer:
2 watts
Explanation:
PLEASE HELP ME WITH THIS!!!!
Answer:
wasts materials such as cans. it can hit space crafts and satellites. no one has ever been killed by space debris, space vessels very rarely are seriously damaged.
Which of the following is NOT a example
of a chemical change?
A. an egg being cooked
B. a piece of paper being torn
C. a piece of bread being toasted
Answer:
B. a piece of paper being torn
Explanation:
A chemical change is one that cannot be reversed. This means the original properties of the substance or object cannot be restored.
If you cook a raw egg, it would turn into a boiled egg (or a poached egg, however it is being cooked). The reaction is irreversible, so you cannot turn the cooked egg back into a raw egg - it is basically impossible to 'uncook' an already cooked egg.
When you toast a piece of bread, it turns into toast. You can't 'untoast' it back into bread. The chemical changes have already occurred and cannot be undone.
If you tear a piece of paper, it is still paper. You are only ripping it, not changing anything about it. You could simply tape the torn bit back to the original bit, or glue it - either way, it is still paper and nothing has occurred to drastically change the physical state of it.
Therefore, B is not a chemical change.
Will an object experience a greater force of gravity on the earth or moon? Why?
Answer:
Earth’s gravitational force is stronger
Explanation:
Earth’s gravitational force is stronger than the moon because of the presence of more massive objects in earth; on the flip side, the moon’s gravity is weaker than the earth due to smaller in size as compared to the earth. Earth gravity is denoted by g; conversely, moon gravity is denoted by gm
Answer: The greater an object's mass, the more gravitational force it exerts. So, to begin answering your question, Earth has a greater gravitational pull than the moon simply because the Earth is more massive. That's why the moon isn't pulled out of Earth's orbit by the gravity of larger planets or by the sun.
Explanation:
Example of electrical to sound? And explain how the energy is changing forms?
microphone for example
A car advertisement states that a certain car can selerate from rest to 20 m/s in 7 seconds. Find the car's average acceleration
Answer:
2.86m/s²
Explanation:
[tex]\boxed{average \: acceleration = \frac{change \: in \: velocity}{time} }[/tex]
Car's average acceleration
[tex] = \frac{20 - 0}{7} \\ = 2.86 \: m/ {s}^{2} \: (3 \: s.f.)[/tex]
The reason why the change in velocity over time is average acceleration is because we are finding the total difference in velocity and dividing it against the total duration. This means that the acceleration of the car can vary throughout the 7 seconds (may not be a constant acceleration) but on average, the car's acceleration 2.86m/s², to 3 significant figures.
Change in velocity
= v -v₀
= final velocity -initial velocity
Since the car is at rest at the beginning, the initial velocity (v₀) is 0m/s.
Answer:
Given :-Acceleration = 20 m/sTime = 7 secTo Find :-Average acceleration
Solution :-As we are already knowing that
[tex] \sf Acceleration_{Avg} [/tex] = TA/T
TA = Total acceleration
T = Time
A = 20/7
A = 2.85 m/s²
Question 1 of 10
Which situation represents the highest entropy of a deck of playing cards?
O A. In four piles, organized by suit
B. Stacked in a deck
C. In order of face value
D. Scattered over the ground
SUBMIT
Answer:
D.
Explanation:
Entropy is the measurement of disorder in a system. The greater the entropy the more disorder/mess there is. Options A B and C all have organized systems so D is the only one with the least orderly scenario
Scattered over the ground represents the highest entropy of a deck of playing cards.
What is entropy?Entropy is a thermodynamic quantity representing the unavailability of a system's thermal energy for conversion into mechanical work, often interpreted as the degree of disorder or randomness in the system.
Entropy is the measurement of disorder in a system. The greater the entropy the more disorder/mess there is. Options A,B and C all have organized systems so, D is the only one with the least orderly scenario
Hence, the option D is correct.
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A force of 900 N pushes a wedge 0.10 m into a log. If the work done on the log is 50 J, what is the efficiency of the wedge?
Answer:
I'm fairly certain it's 1,800
Explanation:
The efficiency of the wedge with force F=900 N displaces the wedge 0.10 m is 55.55% or 56%.
What is the efficiency of the machine?The efficiency of the machine equals the ratio of output energy and input energy. It is also defined as the ratio of work done on a load by the machine to the work done on the effort by the machine.
A load is defined as the weight lifted by the machine. The effort is defined as the force applied to bring the desired change in the load. Work done is defined as the product of force and displacement.
The efficiency, η = Output power / Input power, and the highest efficiency of the machine is equal to one. The efficiency of the machine has no unit. The efficiency η = (Actual work done / Ideal work done) × 100.
From the given,
Force = 900 N
Displacement = 0.1 m
Work done = F × s = 900×0.1 = 90 J
Actual work done = 50 J
Efficiency,η = (50/90) × 100
η = 55.55 %
Thus, the efficiency of the wedge is 55.56%.
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What are the velocity and acceleration of the ball at the highest point in its path? What are the velocity and acceleration of the ball at the highest point in its path? V=0,a=0. V=0,a=9.8m/s2up. V=0,a=9.8m/s2down. V=9.8m/supa=0. V=9.8m/sdowna=0
Answer:
v = 0 and a = 9.8 m/s²
Explanation:
When an object reaches the highest point, its velocity is equal to 0. After reaching the highest point, it starts to decelerate. The acceleration is in the downward direction and it is equal to g i.e. 9.8 m/s².
So, the velocity and acceleration of the ball at the highest point in its path is 0 and 9.8 m/s² downward.
Hence, the correct option is (d).
Can someone please give me the answer by 10 minutes
help plss .. Two bicyclists are accelerating forward in a straight line, and Biker 1 has less
mass than Biker 2. If the net force on the bikers is the same, which statement
describes their acceleration?
Explanation:
Remember Newton's Second Law.
[tex]F=ma[/tex]
If the force acting on both bikers is the same, we can look at the relationship between acceleration and mass.
If Biker 1 has a mass of 10kg and Biker 2 has a mass of 20kg, and both are being acted upon by a force of 100 N, let's see what that looks like. [tex]100 = 10*a_1 \rightarrow a_1 = 100/10 = 10[/tex]
[tex]100 = 20 *a_2 \rightarrow a_2 = 100/20 = 5[/tex]
So, given the same force, an object with GREATER mass will have less acceleration.
Why do you think that this type of fossil is called a print fossil?
Answer:
Fossils are the remains of plants, animals, fungi, bacteria, and single-celled living things that have been replaced by rock material or impressions of organisms preserved in rock.
Answer ☝ on pic that is non print fossil of dinousor
Answer ☝ on the pic is print fossil of turtle
# CARRY ON LEARNING
# SORRY
What is kinetic energy
Answer:
Kinetic energy, form of energy that an object or a particle has by reason of its motion. ... Kinetic energy is a property of a moving object or particle and depends not only on its motion but also on its mass.
Credits to britannica.com
Explanation:
Hope this helps
Kinetic energy of an object is the energy that it possesses due to its motion.
Taco Bell sells 6 Tacos for $9.00. Del Taco sells 4 tacos for $8.00. is a better deal, because it costs less per taco.
Answer:
I'd say taco bell is a better deal, because you get more tacos.
Explanation:
but that's just what I think
Calculate the BMI for a person who is 5'1" and weighs 172 pounds before you calculate the BMI you must convert the height into meters and the weight into kg you can use the internet to convert them
The answer for this are
32.9
.03
184.86
It’s PE
Answer:
It is 32.9
Explanation:
A plate has an area of 1m square. It slide down an incline plane , having an angle of inclined 60° to horizontal, which a velocity of 0.75m/s. The thickness of oil film between the plate and the plate is 2mm. Find the viscosity of the fluid if the weight of the plate is 90N
Answer:
[tex]\mu =0.169704 Ns/m^2[/tex]
Explanation:
From the question we are told that
Area of plate[tex]a=1m^2[/tex]
Angle of inclination [tex]\theta=60 \textdegree[/tex]
Velocity [tex]v=0.75m/s[/tex]
Thickness of oil [tex]t=2mm[/tex]
Weight of plate [tex]w=90N[/tex]
Generally the equation for shear force is mathematically given by
[tex]F=mgsin45 \textdegree[/tex]
[tex]F=90sin45 \textdegree[/tex]
[tex]F=63.639N[/tex]
[tex]F=\mu* \frac{v}{t}[/tex]
[tex]F=\mu* \frac{0.75}{2*10^-^3}[/tex]
[tex]\mu* \frac{0.75}{2*10^-^3}=63.639N[/tex]
[tex]\mu =\frac{63.639}{375}[/tex]
Therefore viscosity is given by
[tex]\mu =0.169704 Ns/m^2[/tex]
Displacement vectors of 1m north, 3 m south, 6 m north, and 4 m south
combine to a total displacement of *
Answer:
zero
it ends at the starting point
Explanation:
Define work What is the unit for work? For Physics, thanks.
Answer:
Work, in physics, measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement
Explanation:
Is Radioactive decay a way to find the relative age of a rock?
True
False
5 Select the correct answer. Which statement is true? OA. The speed of sound in air is inversely proportional to the temperature of the air. O B. The speed of sound in air is directly proportional to the temperature of the air. OC. The speed of sound in air is twice the temperature of the air. C D The speed of sound in air is not affected by the temperature of the air.
The speed of sound in air is twice the temperature of the air
Answer: The speed of sound in air is twice the temperature of the air
Explanation:
1.
Sarah has a chocolate box that has a length of 12 cm, a width of 6 cm, and a height of 9
cm. What is the volume of the box?
2.
A water tank is 90 m long. 60 m wide, and 40 m deep. What is the volume of the water
tank?
3. A rectangular prism has a length of 4 m, a height of 9 m, and a width of 2 m. What is the
volume of the prism?
Answer:
i d k ok
Explanation:
Which of the following does not describe when something has acceleration?
Changes in displacement
Changes in speed
Changes in direction
Changes in speed and direction
Answer:
changes in displacement
Explanation:
Can someone help me answer this question
A(n) _____ represents the U.S. in a foreign country.
A. attorney general
B. ambassador
C. secretary
D. embassy
Answer:
B(Ambassador)
Explanation:
The president appoints ambassadors to foreign countries to represent the United States.
How do you solve the resultant force and direction.
Answer:
To find the resultant force subtract the magnitude of the smaller force from the magnitude of the larger force. The direction of the resultant force is in the same direction as the larger force. A force of 5 N acts to the right, and a force of 3 N act to the left. Calculate the resultant force.Explain the centripetal force or Newton's second law...
Answer: a centripetal force is toward the center of curvature, the same as the direction of centripetal acceleration. According to Newton's second law of motion, net force is mass times acceleration: net . For uniform circular motion, the acceleration is the centripetal acceleration
Explanation:
Centripetal force is the force which causes the change in direction of velocity towards the center of the circular motion of an object.
What is Centripetal Force?Centripetal force is any kind of force which causes a change in the direction of velocity of an object which is moving towards the center of the circular motion. The component of this force which is perpendicular to the velocity of the object is the part which results in the centripetal force.
The force of gravity which acts up on a satellite in the orbit is an example of a centripetal force. The friction of the tires of a car which makes a turn that is similarly provides centripetal force on the car.
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