Answer:
A
Explanation:
The slope of the graph has the units of vertical axis divided by horizontal axis. This means that the slope of a distance vs time graph is distance/time, or velocity.
Slope is calculated by "rise over run" so C is incorrect.
Since the slope represents velocity, a constant slope equates to a constant velocity, hence B is incorrect. Same reasoning for D being incorrect: if the slope is zero, the object is not moving.
Spaceship 1 and Spaceship 2 have equal masses of 300kg. They collide. Spaceship 1's final speed is 3 m/s, and Spaceship 2's final speed is 2 m/s in the same direction. What is their combined momentum? A. 600 kg-m/s B. 1,500 kg-m/s C. 1,200 kg-m/s D. 900 kg-m/s
Answer:
B. 1500 kg*m/s
Explanation:
Momentum p = m* v
In any type of collision, the total momentum is preserved!
The total momentum before and the total momentum after the collision is the same. We know the mass and speed after the collision so we can calculate the total momentum.
p1 + p2 =
m1*v1 + m2*v2
m1 = me = 300 kg
v1 = 3 m/s
v2 = 2 m/s
Substitute the given numbers:
300*3 + 300+2
900 + 600
1500 kg*m/s, which is answer B.
Tina and her puppy are tugging on a rope, each pulling on opposite ends.
When is Tina doing work?
O the entire time she plays with the puppy
o whenever she pulls the puppy toward her
O when she holds the rope steady as the puppy pulls it
O when she lets go of the rope and the puppy pulls it away
C. When she holds the rope steady as the puppy pulls it
Explanation:
because she is having to stay still as the force on the other end is pulling away, this is causing her body to work
According to the information, Tina is doing work when she holds the rope steady as the puppy pulls it. Thus, the correct option for this question is C.
What is work done in terms of physics?In terms of physics, work done may be characterized as the product of the component of the force in the direction of the displacement and the magnitude of this displacement. The formula for calculating work done is as follows:
Work done = Force (F) × Displacement (D).According to the context of this question, when Tina and her puppy are tugging on a rope, each pulling on opposite ends. The work done by both is estimated when they hold and pull the rope toward their side. The more they stretch the more work is performed by them.
Therefore, Tina is doing work when she holds the rope steady as the puppy pulls it. Thus, the correct option for this question is C.
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As hotter material _______, ________material sinks. a. Sinks, colder b. Rises, warmer c. Rises, colder d. Sinks, warmer
Answer:
C
Explanation:
Hot air rises because when you heat air (or any other gas for that matter), it expands. When the air expands, it becomes less dense than the air around it. The less dense hot air then floats in the more dense cold air much like wood floats on water because wood is less dense than water.
As hotter material gets colder it will sinks down. In the hotter state the molecules gets energetic and gets far apart making them free to rise in the air. Thus option a is correct.
What is sinking ?Hot air is less dense than cold air, which is why hot air rises and cold air descends. The earth's weather is controlled by hot and cold air currents. The planet is heated primarily by the sun, which also generates the planet's hot and cold air energy systems.
Since warm air currents originate over oceans, they frequently bring rain. Tropical storms and hurricanes develop at sea and eventually travel near land for this reason.
As hot air from the earth's surface rises, it rapidly turns into cold air as it approaches space. As hot air cools, it descends back to the earth's surface, where it is warmed by the ocean before rising once more. An example of this is a convection current. Thus, option a is correct.
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1. You wish to heat 20 kg of water from 40°C to 80°C. How many kcal of heat are necessary to do this? To how many kJ does this correspond?
Answer:
3,343.68kJExplanation:
Heat energy used up can be calculated using the formula:
H = mcΔt
m = mass oof the object (in kg) = 20kg
c = specific heat capacity of water = 4179.6J/kg°C
Δt change in temperature = 80-40 = 40°C
H= 20* 4179.6 * 40
H = 3,343,680Joules
H = 3,343.68kJ
What is the inverse tangent of 0.9?
O A. 64.2
O B. 90.0
O C. 42.0
O D. 0.016°
Answer:
i think the aswers is C,
The formation of a product in the reaction is based on what
Answer:
c
Explanation:
there is formation of products when t reactants react or collied
If for every increase of 1 for x, y increases by 2, x and y have an) -
relationship
O
A. negative
O
B. linear
O
C. inverse
O
D. circular
SUBMIT
Answer:
The correct option is B.
B) Linear
Explanation:
Suppose initially the value of x is 0, for which y is also 0. When x is increased to 1, the value of y becomes 2. If the value of x is increase to 2, the value of y becomes 4. Similarly, if x is increases to 3,4, and 5, the corresponding values of y we get are 6,8 and 10.
From the above data, we can model that the above relation is:
y = 2x
I've attached the graph of this function below. We can clearly see from the graph that the relation between x and y is linear.
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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How long will a radioactive isotope decay?
Until there's none of it left. Different radioactive isotopes decay at different rates. And a bigger pile of it will last longer than a smaller pile. Without knowing WHICH radioactive isotope you're asking about, and how much of it you started out with, the answer could turn out to be anywhere between 1 millionth of a second and 1 million years.
Which characteristics do temperate marine and temperate continental climates have in common? Check all that apply.
mild winters
hot summers
many tall trees
moderate amount of precipitation
two seasons with temperature differences
Answer:
moderate amount of precipitation
two seasons with temperature differences
Explanation:
Temperate marine climates is also known as oceanic climate and areas who experience this climate are closer to oceans. There is relative precipitation all round the year due to the close proximity to the water body and have the hot and cold season.
The temperate continental climate also has two season and relative rainfall but found in the areas along the Northern hemispheres.
Both climates have moderate amount of precipitation and two seasons with temperature differences.
Answer:
D
Explanation:
EDGE 2021
A student is pushing a box across the room. To push the box three times farther, the student needs to do how much work?
Answer:
Removing some of the books reduced the mass of the box, and less force was needed to push it across the floor.
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
Circuit questions. Plz help. Only answer is ok
How does population density differ from population size?
а. Population size takes all organisms into account while population density only takes specific age
groups of the population into account
b. Population size is the total number of organisms, while population density is the total number of
organisms within a given area
C Population size is the total number of organisms within a given area, while population density is the
total number of organisms of a specific age
d. Population size is the total number of organisms of all species, while population density is the total
number of organisms of a specific species
Answer: B
Explanation:
Population size focuses on the size of the population. That is, the total number of organisms in a population.
While population density focuses on the density of the population. That is, mean number of organisms per unit area or volume.
Therefore, Population size is the total number of organisms, while population density is the total number of
organisms within a given area
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)
What are factors that would change the position of the wave lengths measured? (There are more than one answer.) a) size of the tube b) tuning fork frequency c) distance between the tuning fork and tube d) room temperature e) area of the tube
Answer:
Tuning fork frequency
Room temperature
Explanation:
What is the amount of effort required to lift up 600N load by using a lever of one meter length whose fulcrum is 20cm far from load? Efficiency=75%
Answer: 112.5N
Explanation: Given that the
Load L = 600N
Distance moved by load = 20cm
Since the lever is one metre, the distance moved by the effort will be
100 cm - 20cm = 80 cm
Efficiency = 75%
Efficiency of a machine is the ratio of the effort multiply by distance covered by the effort to the load multiply by the distance covered by the load as percentage.
75/100 = (effort × 0.8)/ ( 600 × 0.2)
Cross multiply
80 effort = 9000
Effort = 9000/80
Effort = 112.5 N
Therefore, the amount of effort required to lift up the load is 112.5N
formular for calculating resistors in parallel
Answer:
Answer is 1/RT=1/RT1+1/RT2+1/RT3
Use the following to answer question 46
I . increase the current
II. use a stronger magnet
III. use thicker wire
IV. reverse the battery
V. add more coils of wire inside the magnet
46. To increase the force with which the wire is pushed when the switch is closed, which of
the following things could be done?
a. I and II only
b. II, III, and IV only
C. II and IV only
d. I, II and V only
47. A group of students had built a homemade motor and were in the process of trying to
test it. When they hooked it up to their battery they found that the wires in their coil got hot, but the coil would not turn. Of the following solutions, which would be their best
course of action to make the motor spin?
a. add more wire to the coil
b. use a stronger magnet
C. use a higher voltage battery
d. plug into an AC source
Answer:
46.) A
47.) A
Explanation:
46.) To increase the force with which the wire is pushed when the switch is closed, the current flowing through the wire should be increased and the stronger magnet should be used.
Remember that
F = BIL
The force is directly proportional to magnetic field B and current I
a. I and II only
47.) Since the wires in their coil got hot, and the coil would not turn, this is overheating which may be as a result of to much voltage supply compare to the length of the length of the coil of wire. To correct this, more wire should be added to the coil.
Which graph would you use to show the percentage of cookies sold by each
team?
A. Circle graph
B. Bar graph
C. Stemplot
D. Line graph
Answer:
You would use a bar graph
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".
In an area of the deep ocean, hot magma emerges from a crack in Earth’s crust. Which statement describes what will happen to the seawater above the crack as a result of convection?
Water molecules will break apart and flow in a circular pattern.
Water molecules will bond together and rise upward.
The water will become more dense and sink downward.
The water will become less dense and rise upward.
Answer: D
Explanation:
Hot magma erupts from a crack in Earth’s crust with a very high temperature that will surely break the bond of water molecules in contact. As a result of this, The water molecules will become less dense and rise upward.
Therefore, "The water will become less dense and rise upward " is the best statement to describes what will happen to the seawater above the crack as a result of convection.
The water will become less dense and rise upward because less denser materials move upward and more denser comes downward.
What will happen to the seawater above the crack as a result of convection?The seawater will become less dense and rise upward above the crack as a result of convection because water is less denser and the magma that erupts from the crack is denser due to its high viscosity.
So we can conclude that the water will become less dense and rise upward because less denser materials move upward and more denser comes downward.
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A ball held 2.0 meters above the floor has 59 joules of potential energy the bald mass is about
Answer:
Mass of ball = 3.0102 Kg.
Explanation:
Potential energy at height h is given by
PE = mgh
where m is the mass of the body
g is the the acceleration due to gravity whose value is 9.8 m/s^2
h is the height from surface level
PE is potential energy
In the problem given h = 2 meters
PE = 59 joules
59 = m*9.8*2
=> m = 59/9.8*2 = 3.0102 Kg
Thus, mass of ball is 3.0102 Kg.
Answer:
3
Explanation:
Top person is wrong
just did lesson
Which is a resource that the National Park Service manages?
A. memorials
B. wildlife refuges
C. ecosystems
D. endangered species
Answer:
Which is a resource that the National Park Service manages?
A. memorials
B. wildlife refuges
Answer:
wildlife refuges
Explanation:
Question 14 of 30
1 Point
Which of the following ideas was proposed by the ancient Greeks about 2500
years ago?
O A. Atoms consist of positive and negative charges.
O B. Atoms are indivisible units of matter.
OC. All atoms are alike.
O D. Atoms are composed of protons, neutrons, and electrons.
SUBMIT
Answer: a.
Explanation: i have done this before .. hope this helps (⌐■_■)
Answer:
B
Explanation:
HACE 2500 AÑOS NO SE CONOCÍAN LAS CARGAS ATÓMICAS.
how do you calculate heat resistance
Answer:
Thermal Resistance (R-Value)
According to this definition and Equation 1, Equation 2, therefore, can be obtained. As indicated in Equation 2, the value of the thermal resistance can be determined by dividing the thickness with thermal conductivity of the specimen.
Please Help me in this Question!!
Answer:
(a) 4.4 m/s²
(b) 27 N
Explanation:
Draw a free body diagram for each block. There are four forces on the sliding block:
Tension force T pulling to the right,
Weight force mg pulling down,
Normal force N pushing up,
and friction force Nμ pulling left.
There are two forces on the hanging block:
Tension force T pulling up,
and weight force mg pulling down.
Sum of forces on the sliding block in the +y direction:
∑F = ma
N − mg = 0
N = mg
Sum of forces on the sliding block in the +x direction:
∑F = ma
T − Nμ = ma
T − mgμ = ma
Sum of forces on the hanging block in the -y direction:
∑F = ma
mg − T = ma
T = mg − ma
(a) Substitute:
mg − ma − mgμ = ma
g − a − gμ = a
g (1 − μ) = 2a
a = g (1 − μ) / 2
Plug in values:
a = (9.8 m/s²) (1 − 0.11) / 2
a = 4.4 m/s²
(b) Substitute:
T − mgμ = mg − T
2T = mg (1 + μ)
T = mg (1 + μ) / 2
Plug in values:
T = (5.0 kg) (9.8 m/s²) (1 + 0.11) / 2
T = 27 N
list the three components of effective communication and give an example of each
Answer:
The three components of effective communication are:
Sending CommunicationReceiving CommunicationFeedbackExplanation:
1) Sending CommunicationOne should think about what he is going to say, structure his message and focus clearly on a the purpose of sending a message. For example if an employer wants to communicate an employee to improve his performance, he should focus hid communication on the results rather than on his failures.
2) Receiving CommunicationThe person on the other end of the communication should be a good listener. For example in the example given, even if the employer effectively communicates his side of the communication, but the employee is not paying his full attention to what his boss is saying, he wouldn't be able to make much of a difference.
3) FeedbackAfter sending and receiving communication, feedback should be given to complete the communication effectively. For example the employer may tell his boss about what he understood from his boss's speech, or what will he do to improve his performance.
Which changes would result in a decrease in the gravitational force between two objects? Check all that apply
increasing the distance between the objects
decreasing the distance between the objects
increasing the mass of one of the objects
Dincreasing the mass of both objects
decreasing the mass of one of the objects
decreasing the mass of both objects
We need to find how the gravitational force between two object decreases.
The gravitational force between the objects will decrease by
increasing the distance between the objects
decreasing the mass of one of the objects
decreasing the mass of both objects
Gravitational force is given by
[tex]F=\dfrac{Gm_1m_2}{r^2}[/tex]
where
[tex]G[/tex] = Gravitational constant = [tex]6.674\times 10^{-11}\ \text{Nm}^2/\text{kg}^{2}[/tex]
[tex]m_1[/tex] = Mass of one object
[tex]m_2[/tex] = Mass of other object
[tex]r[/tex] = Distance between the two objects
It can be seen that the gravitational force is proportional to the mass of the objects
[tex]F\propto m_1m_2[/tex]
and inversely proportional to the square of the distance between them
[tex]F\propto \dfrac{1}{r^2}[/tex]
So, if mass of one of the objects decreases then the gravitational force will decrease.
Also, if the distance between the objects increases the gravitational force will decrease.
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Answer:
A, E, F
Explanation:
Right on ED2021
How may the desire for a perfect lawn related to environmental pollution
Answer:
Lawns are extremely costly in many ways, including dollars spent on them, the deadly ... Using lawn equipment also significantly adds to noise pollution. ... to all of the environmental damages, including water pollution, caused by fracking. ... ONE's ambition is to remain unbiased and to provide a good
Explanation:
Answer:
The gases from the lawn mower to mow the grass, weed killer toxicity affects, too much of the seeds to help grow your grass can actually harm your grass, etc.
Explanation: