this is for my physical science class.
Which kind of wave is a wave on the electromagnetic spectrum?
a. matter wave
b. longitudinal wave
c. mechanical wave
d. transverse wave
Answer:
It is a transverse wave. The other types of waves require a physical medium (air, water, etc.) for transmission.
A cannon fires a cannonball directly upwards at +150m/s. How long does it take for the cannonball to reach maximum height?
Question 2 of 5
Scientists predict that the human population will continue to increase. Which
two events are likely to occur as a result?
A. The amount of water released into streams and rivers will
increase.
B. The amount of natural space will decrease as suburban areas
increase.
C. More people will move to the cities, increasing the amount of
natural space.
D. Air pollution will increase due to increased use of fossil fuels.
Answer: A. The amount of water releases into streams and rivers will increase.
write an application of convergent and divergent lenses in your daily life solution.
The magnifying glass represents one of the simplest, most direct applications of a converging lens. As light enters the lens, it becomes focused to a specific focal point in front of the center of the lens. Once you bring the magnifying glass to the optimal distance, so the focal point reaches the object, the object will appear at maximum magnification. Move the glass farther from the object and it will become distorted; move the glass closer to the object and it will decrease in magnification.
Divergent lenses are used on flashlights to magnify the light produced by the bulb. The light falls on the concave side of the lens, and the rays diverge on the other side, thereby increasing the apparent radius of the light source and providing a wider beam.
Antwon made a table to study some simple machines. A 2-column table with 4 rows titled Types of Simple Machines. The first column labeled name has entries screw, pulley, wheel and axle, inclined plane. The second column labeled description has entries holds things together, can also be used to lift objects, has threads that look like an inclined plane spiralling around it; consists of a grooved wheel and rope, changes direction of force, can be used to lift objects; consists of 2 circular objects, reduced friction when object is being moved; decreases the distance and decreases the amount of force needed, can be used to lift objects. Which best describes how to correct the error in the table? Remove "can also be used to lift objects" from the description of a screw. Add "looks like two inclined planes placed back-to-back" to the description of a wheel and axle. Move "reduces friction when object is being moved" to the description of a pulley. Change "decreases distance" to "increases distance" in the description of an inclined plane.
Answer:
D) Change "decreases distance" to "increase distance" in the description of an inclined plane.
Explanation:
Sorry I'm late to answer your question!
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I did the quiz on edge recently
To produce a net force on a system, must there be an externally applied net force?.
Determine the change in velocity of a car that starts at rest and has a final velocity of
20 m/s north.
answer:
20-0
=20
Explanation:
from rest initial velocity is zero.
final velocity is 20
hence change in velocity is;
20-0
=20
Overgrazing occurs when farm animals, like cows, sheep, and horses, eat all the plants on an area of land. When all of the plants have been eaten, the soil is left bare as is shown in the picture below.
Since overgrazing removes the plants that help hold the soil in place, overgrazing can cause increased _______.
A.
rainfall
B.
erosion
C.
snow
D.
wind
Answer:
erosion
Explanation:
because i just got it right on study island
When the mass of the object decreases, explain the effect that change in mass has on the potential and kinetic energy of the object.
When the mass of the object decreases, the potential and kinetic energy of the object also decreases.
WHAT IS KINETIC AND POTENTIAL ENERGY?Kinetic energy is the energy due to the motion of an object while potential energy is the energy due to rest of an object.
The kinetic and potential energy are calculated as follows:
K.E = ½ × mass × velocity ²P.E = mass × acceleration due to gravity × heightTherefore, when the mass of the object decreases, the potential and kinetic energy needed to make it move or be at rest respectively also decreases.
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what are overtones? how are they related to the quality of a sound
Calculate the acceleration of a truck moving along a straight path if its speed increases from
0.0 m/s to 15 m/s in 10.0 s.
Answer:
I'm not to sure but I think the answer is 1.5m/s^2
Explanation:
Acceleration = Change in Velocity over Time.
So we get 15 - 0.0 divided by 10.0 which = 1.5m/s^2
But again I'm no expert I'm learning this stuff just like you guys.
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Question 8 of 10
Which chronic disease is related to poor die
A Diabetes
El Asthme
c. Lung cancer
O Engliysema
Answer:
diabetes,because you eat same food everyday you don't have other vitamins
What direct method of generating electricity?
For Me Is "Hydropower."
Because Hydropower is most efficient method of generating electricity because 95 per cent of the energy of flowing water gets converted into electricity—only five per cent of the energy is converted into other forms of energy.
Which type of action forces cause a reaction force?
A. Only large action forces will cause a reaction force.
B. All forces cause a reaction force.
C. Only small forces cause a reaction force.
Answer:
B
from newton's law , for every action there is an equal and opposite reaction, regardless of the size of the force
A lens with a focal length of 35cm
is used to form an image of an
object. When this lens is placed a
certain distance X from the object,
no image is formed. Give this
distance X in cm.
Since the focal length of the lens is 35 cm, at a distance of 35 cm from the lens, no image is formed.
What are lenses?Lenses are portions of a transparent medium bounded by two curved surfaces or one curved surface and one plane surface.
Lenses are used to produce images of an object on. screen.
The images produced may be real or virtual.
For diverging lenses, images produced are always virtual.
For a converging lens, images produced may be virtual or real.
However, when an object is placed exactly at the focal length of a lens, no image is produced.
Therefore, the distance X when no image will be produced in the lens is the focal length of the lens, 35 cm.
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A 2.60 kg block is in equilibrium on an incline
of 24.3◦
.
The acceleration of gravity is 9.81 m/s
2
.
What is Fn of the incline on the block?
Answer in units of N.
Answer:
W = m g = 2.60 * 9.81 = 25.5 N weight of block
Fn = W cos theta = 25.5 N * cos 24.3 = 23.2 N normal force of plane
Think back to when you were a kid riding in the backseat of the car. Maybe you once had a milkshake in your hand when your mom hit the brakes. You were secured by your seat belt, but you jer-ked forward and the milkshake splashed all over the front seat…and your mom. That situation probably never happened to you. But think about something that has happened to you physically—a fall, a jump, an accident, or something you may have done hundreds of times in your favorite sport. Analyze the action and describe it in terms of Newton’s laws. Identify the initial conditions and the forces involved. If the action is a sequence of events, analyze it step by step. The more complex the sequence of events, the better!
Answer:
In Newton’s first law, an object at rest remains at rest until an external force isapplied. When I play soccer, the soccer ball will be at rest on the field (the initial condition) andremain in that spot on the field until I kick it (my muscles applying an external force to the ball).According to Newton’s second law, force = mass x acceleration (F=ma). When I kick the resting soccer ball, which has a given mass, it will accelerate in the direction that I kick it. From the equation, acceleration = force divided by mass. Therefore, since the mass of the soccer ball is fixed, the stronger my leg is and the more force I can apply to the ball, the faster it willaccelerate.According to Newton’s first law, an object in motion remains in motion until an external force isapplied. After I kick the soccer ball, it will continue in motion in the direction that I kicked it,but its acceleration will gradually slow down due to the external forces of friction from the airand the surface of the field. According to Newton’s third law, for every action there is an equal and opposite reaction.When I kick the soccer ball forward, if I also kick it in an upward direction, such as a thirty-degree angle from the field, it will come down at an angle when it strikes the field. When theball lands and strikes the field, there will be an equal and opposite reaction whereby instead oftraveling downward it will bounce of the surface of the field and will then be travelling upward.
A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the horizontal force required to keep the puck sliding at constant velocity is
Help!! DOWN BELOW
NO SCAMS PLEASE
how do animal weather rocks
Answer:
Burrowing animals can cause weathering. By digging for food or making space to live in the animal may break apart rock. The growing roots of a tree can also break apart rock.
what is the independent variable for the experiment
answer
a variable thay doesnt depend on another variable isnt changed by any factors
explanation
Make the following conversion.
0.0097 mg = _____ g
your answer would be 9.7
Answer:
0.0097 mg = 9.7e-9 g
Explanation:
A swimmer jumps from a diving board 7 m above the level of water with an initial horizontal velocity of 5 m/s. The total time taken to reach the water is:
Answer:
here's the answer to your question hope it helps you
Explanation:
time=distance/speed
=7m/5ms
=1.4s
How long did it take for the dinosaurs to die after the asteroid?.
Answer:
it's estimated to within a couple of thousands of years.
Explanation:
For a long time it was thought that the dinosaurs died out 65 million years ago. But Paul explains, 'The dating of those layers of clay around the world is very accurate.
One man lifts a 300 kg crate from the ground to the top of a loading dock 1 meter high. Another man lifts the same crate using a ramp 3 meters long, 1 meter high. What can you say about the amount of work being done?
Select one:
a. More work is done when the crate is lifted without the ramp.
b. More work is done when the ramp is used.
c. No work is done.
d. The same amount of work is done.
Answer:
D
Explanation:
Work done =force x distance in the direction of force applied
I think its d
Where on a roller coaster is centripetal forces at work.
Regardless of where the cars are in the loop, centripetal force is always directed toward the center of rotation. So even if a car you're riding in is at the top of a loop, upside-down, you will feel pressed into your seat.
2. What are the SI units of speed? What are the SI units of velocity?
S = Distance/ Time
= m/s
Same for velocity but instead of distance displacement takes place
S = Displacement/ Time
= m/s
A quarterback back pedals 2.1 meters northward and then runs 7.4 meters southward
What is the magnitude and direction of the displacement
Answer:
-5.3 m
Explanation:
Consider north to be the positive direction, and south to be the negative direction. Adding up the displacements gives
(+2.1m) + (-7.4m) = 2.1 - 7.4m = -5.3m (southward direction)
This makes sense because if he travels 2.1 m north, then 7.4 south, he would end up south of where he started because he passed 2.1 m and went further
A coin placed on the cover of a book just begins to move when the cover makes an angle of 38 degrees with the horizontal. What is the coefficient of static friction?
Answer:
m g sin theta = force of object along incline due to gravity
N μ = frictional of incline on object where N is the normal force
N = m g cos theta force perpendicular to incline
m g sin theta = N μ = μ m g cos theta
μ = tan theta = tan 38 = .78
) The magnitude of scalar product of two unit vectors perpendicular to each other is
This question involves the concept of the scalar product.
The magnitude of the scalar product will be "0".
SCALAR PRODUCTThe scalar product, also known as the dot product of the two vectors is given by the following formula:
[tex]A.B = |A||B|Cos\theta[/tex]
where,
A.B = Scalar product = ?|A| = Mangnitude of vector A = 1 unit|B| = Magnitude of Vector B = 1 unitθ = Angle between vectors = 90°Therefore,
[tex]A.B = (1)(1)Cos90^o = (1)(1)(0)[/tex]
A.B = 0
Learn more about scalar product here:
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