Which of the following is an example of a device that uses a wheel and axle?
Check all that apply
A. frisbee
B. light bulb
C. doorknob
D. bicycle
(multiple answers)
How does radiation help treat cancer?
It cools down the cancer cells and weakens them.
It cools down the non-cancerous cells and strengthens them.
It heats up the cancer cells and weakens them.
It heats up the non-cancerous cells and strengthens them.
Answer:
C. It heats up the cancer cells and weakens them.
Explanation:
Trust me it is correct the other people are wrong.
The radiation that helped the treating cancer should be option C. It heats up the cancer cells and weakens them.
What is radiation therapy?It is also known as radiotherapy represents the cancer treatment that used a high dose of radiation for killing the cancer cell also the tumors should be shrunk. Here the dose should be low and the radiation should be used in x-rays for seeing inside the body where x-rays of the teeth or bones that should be broken.
Therefore, option c is correct.
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A force of 7.0 N acts on a block of wood at an angle of 50 degrees above the horizontal as the block moves a distance of 6.4 meters to the right. Calculate the work done on the block by the force
Answer:
28.796 J
Explanation:
I hope that it's a correct answer.
The work done on the block of wood by the applied force is 28.8 J.
The given parameters;
force on the block, F = 7 Ninclination of the force, θ = 50⁰distance traveled by the block, d = 6.4 mThe work done on the block of wood by the applied force is calculated as follows;
W = F x dcosθ
W = 7 x 6.4 x cos(50)
W = 28.8 J
Thus, the work done on the block of wood by the applied force is 28.8 J.
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A person is pulled to the right on a sled (total mass of 52.9 kg) across the surface of a frozen pond with a force of 67.7 Newtons so that they move with a constant velocity. What is the force of friction acting on the sled?
Answer:
67.7 N
Explanation:
Draw a free body diagram of the person on the sled. There are four forces:
67.7 N to the right,
friction force to the left,
weight force down,
and normal force up.
Constant velocity means 0 acceleration.
Sum of the forces in the x direction:
∑F = ma
67.7 N − F = 0
F = 67.7 N
Which of the following is a difference between a law and a theory? A law can become a theory but a theory can never become a law. A theory is based on personal feelings but a law is based on testable evidence. A theory can predict the occurrence of a natural event with certainty but a law cannot. A law is usually a mathematical statement but a theory is a proposed statement.
Answer:
a theory is based on personal feelings but a law is based on testable evidence because a law is universal and constant fact of nature it is also an irrefutable theory a theory can become a law but a law can never become a theory it is based several scientific experimenrs
Explanation:
i hope this will help you
based on Newtown law does gravity increase
Answer:
So as the mass of either object increases, the force of gravitational attraction between them also increases. If the mass of one of the objects is doubled, then the force of gravity between them is doubled. If the mass of one of the objects is tripled, then the force of gravity between them is tripled.
Identify and explain the three different ways that charge is built up on an object.
Answer:
There are three ways to charge an object: friction, conduction and induction. Friction involves rubbing on material with another, resulting in electrons moving from one surface to another. ... Friction is useful for charging insulators, which are materials that aren't good conductors.
Explanation:
Help needed!! Which of the following situations would be the BEST use for a circle graph? A. to show how much of the food you eat should be fruits and vegetables B. to compare how many apples, oranges, and bananas were eaten last week C. to compare the nutritional content of fruits to the nutritional content of vegetables D. to show how long different types of fruit can last in your house before they go bad
Answer:
I believe the answer is B. This is the only situation where I see that a circle graph would be the best way to represent it.
Can someone help??
The maximum acceleration of a fist in a karate punch is 4200 m/s2. The mass of the
fist is 0.60 kg. If the fist hits a wooden block, what force does the wood place on the
fist?
Answer:
F = 2520 N
Explanation:
We have,
The maximum acceleration of a fist in a karate punch is 4200 m/s². The mass of the fist is 0.6 kg.
It is required to find the force that the wood place on the fist. Force is given by the product of mass and its acceleration such that,
F = ma
[tex]F=0.6\times 4200\\\\F=2520\ N[/tex]
So, the force of 2520 N is acting on the wood.
A lens of focal length 15.0 cm
forms an image 77.5 cm from the
lens. What was the object
distance?
(Unit = cm)
Answer:
5
Explanation:
The distance of the object is 18.6cm.
How to find the object's distance?According to lens formula we have (1)/(v) + (1)/(u) = (1)/(f), where u = distance of the object from the lens, v = distance of the image from the lens and f = focal length of given lens.
1 / v + 1 /u = 1/f
1 / 15 + 1 /u = 1/77.5
1/77.5 - 1 / 15 = 1/f
1/f = 6 / 465 - 31 / 465
1/f = -25 / 465
1/f = 465 / 25
1/f = 18.6
Lens formula is a well-designed formula that is applicable for concave as well as convex lenses.
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What happens to the pressure of a gas when the volume of its container is increased at constant temperature?
Hope it helps...
Good luck on your assignment
A 10 N block is at the bottom of a frictionless incline as shown to the right. How much work must be done against gravity to move it to the top of the incline?
600j
1000j
4800j
800j
Explanation:
We have,
According to attached figure, the height of the inclined plane is 60 m and force acting on the block is 10 N. It is required to find the work must be done against gravity to move it to the top of the incline. The work done is given by :
W = mgh
or
[tex]W=F\times h\\\\W=10\times 60\\\\W=600\ J[/tex]
Hence, the correct option is (A) "600 J".
what can be done to double the power output of an object?
Answer: double the speed of the object.
Explanation:
From the definition of power, power is the rate at which work is done. That is,
Power P = Work done/time
But
Work done = force × distance
Work done = F×S
Substitute F × S for work done on power formula.
P = (F×S)/t
P = F × S/t
But S/t = velocity V
P = F × V
Since power P is proportional to speed V, to double the power output of an object, the speed V of the object must be doubled.
Answer:
double speed
Explanation:
Which term is the product of force and distance? A) power B) work C) net force D) acceleration
Answer:
B. Work
Explanation:
I took the test! (e2020)
Have an awesome day!
The term is the product of force and distance is work. Therefore, option B is correct.
What is work ?Work is defined as the energy that is applied to or removed from an object by applying force along a displacement. For a constant force acting in the same direction as the motion, the work is simply equal to the product of the force's magnitude and the distance traveled.
Work and energy differ greatly from one another. Work is the transmission of energy over a specific distance in one direction with the aid of a force.
Three categories can be used to classify the type of labor performed. Positive work, negative work, and zero work are the three types. The angle between force and displacement determines the kind of work that is done.
Thus, option B is correct.
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What happens during a chemical reaction ?
Which of the following is a U.S. unit of measurement?
A. Kilogram
B. Liter
C. Foot
D. Meter
A 200 kg roller coaster car is located at the top of a hill where the height is 30 m. What is the velocity when it reaches the bottom of the hill? 5.5 m/s 11.2 m/s 16.7 m/s 24.2 m/s
Answer: 24.2
Explanation:
Answer:
24.2 m/s
Explanation:
Which changes would cause an increase in the resistance of a wire?
Answer:
Resistance can increase relative to Temperature, Nature of Material, Length of Conductor or wire.,and Cross-section area.
Explanation:
Identify solar, wind, nuclear, and tidal power as nonrenewable or renewable energy
resources. Explain your answers.
Answer:
Renewable energy: Tidal, solar and wind
Non renewable energy: nuclear power
Explanation:
Renewable energy is any energy in which its source is always replenished or renewed.
While non renewable energy sources cannot be replenished or renewed immediately because of its limited availability of resources.
Most renewable energy sources are natural sources.
Solar, tidal and wind energy are renewable energy known as clean energy. While nuclear energy is a non renewable energy in which its source of energy is fuel ( uranium e.t.c)
if the moon did not revolve around the sun, would we still see moon phases?
Answer:
First of all the moon does not revolve around the sun but around the earth but yes we would not see moon phases if the moon did not revolve around the earth.
Explanation:
A driver moves with initial velocity of 40m/s accelerates uniformly at a rate of 12m/s2. It attains a velocity 52m/s. calculate the distance covered during the journey.
Answer:
distance=46m
Explanation:
initial velocity(u)=40m/s
final velocity(v)=52m/s
acceleration=12m/s²
distance(s)=?
v²=u²+2as (using equ.of motion)
(52)²=(40)²+2(12)s
2704=1600+24s
24s=2704-1600
24s=1104
s=1104/24
s=46m
The distance covered during the journey is 46m.
To find the answer, we need to know about the Newton's equation of motion.
What are the Newton's equation of motion?Newton's equation of motion are
V=U+atS=Ut+1/2at²V²-U²=2×a×SWhere S=distance
U=initial velocity
V=final velocity
t=time
a= acceleration
What is the distance covered by the driver, if the driver has initial velocity 40m/s, final velocity 52 m/s and acceleration 12 m/s²?Here, U=40m/s, V=52m/s and a= 12 m/s²So, 52²-40²=2×12×S=>2704-1600=24×S
=>1104=24S
=>S=1104/24=46m
Thus, we can conclude that the distance covered during the journey is 46m.
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Explain how reflection and refraction are similar to each other and different from each other.
Answer:
Reflection is the bouncing back off light rays when it hits a surface whilst refraction is the change in direction if light as it travels from one medium to another.They both need a medium or surface to be able to work
Explanation:
When a wave that is moving through a medium encounters the border of that medium, reflection and refraction, both wave characteristics, take place.
Both refraction and reflection alter the wave's behavior by altering the direction it travels in or the rate at which it moves.
What is Refraction?Refraction is the process by which a wave switches while transitioning from one material to another in physics. As an illustration, waves move more quickly in the open ocean than those in the shallow.
A wave can swing around until it is moving perpendicular to the coastline if it is approaching a beach at an angle because the wave's outer portion goes quicker than its inner portion.
When light strikes a material on a plane, reflection occurs, which is when the light bounces back. Refraction is indeed the technique by which light's path changes when it passes through a substance, bending the light.
This is the primary distinction between refraction and reflection. Usually, mirrors are where this occurrence happens.
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Which of the following has the lowest density?
A. Mineral water
B. Air
C. Water
D. Salt water
Answer:
Air.
Explanation:
Mineral water, Water, and Salt water all have density in high amounts. Air doesn’t. It’s literally air.
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55. At the power substation near the edge of a large city, voltages are reduced and current is
sent to the various neighbourhoods. Why don't the neighbourhoods get more current
than what came from the high voltage lines?
a. There are special transformers that reduce current and voltage at the same time.
b. A special DC system is used to change the voltages
C. The total current did increase, but it split off into various smaller currents.
d. The current is run out of energy at the substation so less is available to the
neighbourhoods.
Answer:
I believe the answer is A.
Answer:
A
Explanation:
Two cars collide with each other. Before the collision, one car (m = 1100 kg)
is going north at 18 m/s and the other car (m= 1300 kg) is going south at 16
m/s. What is the momentum of the system made up of the two cars after the
collision?
A. 40,600 kg•m/s north
B. 1000 kg•m/s south
C. 40,600 kg.m/s south
D. 1000 kg•m/s north
Answer: B
Explanation:
In collision, whether elastic or inelastic collisions, momentum is always conserved. That is, the momentum before collision will be equal to the momentum after collision.
Since momentum is a vector quantity, the direction will also be considered.
Momentum = MV - mU
Let
M = 1100 kg is going north
at V = 18 m/s and the other car
m= 1300 kg is going south
at U = 16m/s.
Substitute all the parameters into the formula
Momentum = (1100 × 18) - (1300 × 16)
= 19800 - 20800
= - 1000
It's due south since the final answer is negative.
= 1000 kgm/s due south.
Therefore, the momentum of the system of the two cars after the
collision is 1000 kgm/s due south
Answer:
1000 kg*m/s south
Explanation:
just did it
A driver moves with initial velocity of 40m/s accelerates uniformly at a rate of 12m/s2. It attains a velocity 52m/s. calculate the distance covered during the journey.
Answer:
The total distance covered is 46m
Explanation:
From the question, we have the following given parameters.
Initial Velocity = 40m/s
Acceleration = 12m/s²
Final Velocity = 52m/s
Required
Calculate the distance covered during the journey
The question can be solved using the following equation of motion.
v² = u² + 2as
Where
v = final velocity = 52m/s
u = initial velocity = 40m/s
a = acceleration = 12m/s²
s = distance = ?
By substituting the above values in the stated formula
v² = u² + 2as becomes
52² = 40² + 2 * 12 * s
2704 = 1600 + 24s
Subtract 1600 from both sides
2704 - 1600 = 1600 - 1600 + 24s
1104 = 24s
Divide both sides by 24
1104/24 = 24s/24
46 = s
Reorder
s = 46
Hence, the total distance covered is 46m
Which type of graph would be best for showing the numbers of students in a class with different heights?
A. Circle graph
B. Line graph
C. Bar graph
D. Scatterplot
The answer to this question is line graph
The best type of graph for showing the numbers of students in a class with different heights would be a C. bar graph.
A bar graph allows for the clear representation of discrete categories or groups, making it suitable for comparing and displaying data that can be categorized, such as heights of students. A bar graph consists of vertical or horizontal bars, with the length or height of each bar representing the quantity or frequency of the data category.
In this case, the different heights of students would be plotted on the x-axis, while the corresponding number of students falling into each height category would be represented by the height of the bars on the y-axis.
By using a bar graph, it becomes easy to visually compare the frequency or distribution of students across different height categories. It provides a clear and concise representation of the data, allowing for quick interpretation and analysis of the height distribution within the class. Therefore, Option C is correct.
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The strong nuclear force is ?
Answer: Option B
Explanation:
The nuclear force is the strongest force in the universe. It is much more stronger than all the other forces and is 100 times stronger than the electric force.
The nuclear forces can be defined as the forces generated due to electron and protons in which the electrons have negative charge on it and the protons have positive charge on it.
Due to this force all the atoms and molecules, elements and compounds are held together.
Which converts mechanical energy to electrical energy?
A. A flashlight
B. An electric motor
C. A generator
D. An electromagnet
Answer:
c. A Generator
Explanation:
The whole point of a generator is to produce electrical energy. The generator will use a mechanical motor usually running off of gas to produce electricity.
A body starting from rest moves with uniform acceleration until it attains a speed of 100m/s after 20 s. It maintained this speed for the next 30s and came to rest by uniformly deceleration in 30s. (a.) Find its acceleration. (b)Draw the velocity-Time graph of the motion (c)Using the information given by the graph calculate
The average speed for the whole journey
The total distance travelled
Answer: Let t
be the time in seconds from the beginning of the motion of a particle. If the particle has a velocity of 4 m/s initially (at t=0
) and has a constant acceleration of 2 m/s2
, find the velocity of the particle:
when t=1
when t=2
after t
seconds.
Draw the velocity–time graph for the motion.
Solution
When t=1
, the velocity of the particle is 4+2=6
m/s.
When t=2
, the velocity of the particle is 4+2×2=8
m/s.
After t
seconds, the velocity of the particle is 4+2t
m/s.
Explanation:
