Answer:
When a force acts on an object that is stationary or not moving, the force will cause the object to move, provided there are no other forces preventing that movement. If you throw a ball, you are pushing on it to start its movement. If you drop an object, the force of gravity causes it to move.
hope this helps :)
At t = 0, a car has a speed of 30.0 m/s. At t=6.00 s, its velocity is 12.0 m/s.
What is its average acceleration during this interval? plz help...
Answer: [tex]-3m/s[/tex]
Explanation:
[tex]a=\frac{V_2-V_1}{t}[/tex]
[tex]a=\frac{12-30m}{6s}\\a=-\frac{18m}{6s}\\ a=-3m/s[/tex]
We have a negative acceleration, meaning that the car is slowing down.
A book with a mass of 1.2 kg sits on a bookshelf. If it has gravitational potential energy of 50 j, how high is the shelf ? The acceleration of gravity is 9.8 m/s 2
Answer:
B
Explanation:
The shelf will be b) 4.3 m high
What is Gravitational potential energy ?
Gravitational potential energy is the energy possessed or acquired by an object due to a change in its position when it is present in a gravitational field.
given
mass = 1.2 kg
gravitation potential energy = 50J
h = ?
acceleration of gravity is 9.8 m/s 2
gravitation potential energy = m*g*h
50 J = 1.2 kg * 9.8 m/s^2 * h
h= 4.251 m
h ≈ 4.3 m
The shelf will be b) 4.3 m high
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An acrobat performs with a swing, as shown in the diagram . Which of these most likely happens as the acrobat moves from Point 1 to Point 2?
A. Potential energy decreased and kinetic energy increases.
B. Potential energy increases and kinetic energy decreases.
C. Both potential and kinetic energy increase.
D. Both potential and kinetic energy decrease.
Even on a windy day, most plants can remain upright. Which structure plays the greatest role in providing a plant with this type of support?
A. nucleus
B. mitochondrion
C. cell wall
D. skeleton
Which BEST describes one way igneous rocks form?
A. Sedimentary rocks erode.
B. Sedimentary rocks are compacted.
C. Metamorphic rocks are melted, then cooled.
D. Metamorphic rocks are deposited and cemented.
Pls help! will give brainliest and 75 Points for the correct answers!
Answer:
Well, The first question is C. Both potential and kinetic energy increase. Then, The second question is C. Cell wall. And, The last one is B. Sedimentary rocks ate compacted. Good Luck!
PLEASE ANSWER ASAP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer: I believe the answer is B (the second option)
side note: this shows a physics question . . . it is not
if 34.7 g of O2 reacts with iron to form 79.34 g of iron oxide, how much iron was used in the reaction?
A.
19.84 g
B.
44.64 g
C.
104.1 g
D.
114.04 g
Answer: B. 44.64 g
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
Mass of reactants = mass of iron + mass of oxygen = mass of iron + 34.7 g
Mass of product = mass of iron oxide = 79.34 g
As Mass of reactants = Mass of product
mass of iron + 34.7 g = 79.34 g
mass of iron = 44.64 g
Thus 44.64 g of iron was used in the reaction
In a “minute to win it” game, cards are placed between cups to stack them. The contestant then pulls the card out in hopes that they will end with a set of stacked cups. Why does this work?
There is no friction between the card and the cup.
Inertia will keep the top cup from moving very far. Gravity will pull one cup on top of another.
The opening of the cup is so much bigger than the bottom, even though the cup moves they will both be stacked together.
Both cups are moved the same amount by the friction between them and the card.
Answer:
There is no friction between the card and the cup.
Explanation:
Answer:
The answer option to your question is A) - There is no friction between the card and the cup.
ASAP if you answer right I will mark brainiest
Answer:
I'm glad you asked!
Explanation:
1.Venus is the hottest planet in the solar system.
2.Opportunity explored Mars' surface.
3.Earth is the only planet in the solar system known to have plate Tectonics.
4.Mercury is one of the four planets closest to the Sun.
5.Mercury is the smallest of all planets in the solar system.
6.Messenger is a space aircraft that orbits and studies Mars.
7.Venus has the largest volcano in the solar system.
Using the diagram below, calculate the PE and KE of the ball at the top, middle, and bottom of a drop. SHOW YOUR WORK!!
Write an explanation of what would happen to the ME, PE, and KE of the ball from the top of the drop to the middle of the drop, and then at the bottom.
Answer:
At the top
K.E = 0
P.E = 981 J
Mechanical energy is conserved
P.E is maximum
K.E = 0
At the middle
K.E = 981 J
P.E = 0
Mechanical energy is conserved
K.E is maximum
P.E = 0
At the bottom
K.E = 0
P.E = 981 J
Mechanical energy is conserved
K.E = 0
P.E is maximum
Explanation:
Given that
M= 5kg
H = 20 m
t = 7 s
According to conservation of energy,
At the top
K.E = 0
P.E = mgh
P.E = 5 × 9.81 × 20
P.E = 981 J
Mechanical energy is conserved
P.E is maximum
K.E = 0
At the middle
K.E = 981 J
P.E = 0
Mechanical energy is conserved
K.E is maximum
P.E = 0
At the bottom
K.E = 0
P.E = 981 J
Mechanical energy is conserved
K.E = 0
P.E is maximum
Given that
M= 5kg
H = 20 m
t = 7 s
At the top
K.E = 0
P.E = mgh
P.E = 5 × 9.81 × 20
P.E = 981 J
Mechanical energy is conserved
P.E is maximum
K.E = 0
At the middle
K.E = 981 J
P.E = 0
Mechanical energy is conserved
K.E is maximum
P.E = 0
At the bottom
K.E = 0
P.E = 981 J
Mechanical energy is conserved
K.E = 0
P.E is maximum
Explanation:
Given that
M= 5kg
H = 20 m
t = 7 s
At the top
K.E = 0
P.E = mgh
P.E = 5 × 9.81 × 20
P.E = 981 J
Mechanical energy is conserved
P.E is maximum
K.E = 0
At the middle
K.E = 981 J
P.E = 0
Mechanical energy is conserved
K.E is maximum
P.E = 0
At the bottom
K.E = 0
P.E = 981 J
Mechanical energy is conserved
K.E = 0
P.E is maximum
Plz Help! Will give brainliest!!
If the work output of a simple machine is 40 J and the work input is 50 J, the percent efficiency is _____%.
A. 5/4
B. 10
C. 80
D. 90
Answer: 80%
Explanation:
Answer:
C.80
Explanation:
how do electric and magnetic fields interact to create electromagnets?
Answer:
8548458
Explanation:
95895
Can someone please answer these two science questions. Please don't answer with just anything for the points, I genuinely need the answers. Thanks! :)
6.
Answer:
45 meters
Explanation:
notice that is you multiply the time with the speed the units cancel to get distance.
therefore
distance=velocity(time)
distance=(3)15
distance =45 meters
7.
Answer:
1. the speed is constant
2. the average speed is .5 m/s
Explanation:
I have attached a graph of the data in excel.
from excel i got the equation of the line to be y=.5x with y being distance and x being time.
the function is a position function so if you take the derivative of it you get the velocity which is .5.
since the derivative is a constant the the speed does not change and the average velocity is the derivative.
In a 200 meter sprint there is one curve and one straightaway? true or false
Answer:
I got true
Explanation:
Not the best explanation, but my dad said it was true.
In a series circuit, electrons only flow along one path. Given this information, which of the following is an advantage of series circuits?
A.
The voltage is the same everywhere in a series circuit.
B.
Less resistance is produced as more devices are added to the circuit.
C.
Series circuits are simpler than parallel circuits.
D.
If one part of the circuit breaks, the other parts will still be able to operate.
Answer:
C. Series circuits are simpler than parallel circuits.
Explanation:
In series circuit, all the components are connected in single path of current flow. If one part of the circuit breaks, the whole thing would break and none of the other parts would work. The voltage is not the same everywhere. It is different across each component. In series circuit, net resistance is more as resistance of all the components connected in series are added up. So, the only advantage of a series circuit is that is simpler than the parallel circuits.
Someone HELPPPPPPPPP
MARKING BRAINLIST JUST CHECK WORK
(15 points)
Answer: I'm pretty sure you're right. Believe in yourself!
Explanation:
The burning of fossil fuels contributes to the addition of greenhouse gases to the atmosphere. These gases trap thermal energy in the Earth’s atmosphere. Which of the following would be the most reasonable changes that could result from an increase in the burning of fossil fuels?
A. The air all over the globe would become dirtier.
B. There would be a global rise in temperatures.
C. Ecosystems would become more diverse.
D. Rates of photosynthesis would decrease.
Answer:
B. there would be a global rise in temperatures
Hence, global warming
Explanation:
hope this helped! :D
PLS I NEED THIS QUICK!!!!WILL GIVE BRAINLY!
you decide to push on a brick wall with all your might for 5 minutes. you push so hard that you begin to sweat. however, the wall does not move. if you end up pushing with a force of 500 newtons, how much work did you do?
Answer:
2500
Explanation:
URGENT!! Please answer
Pillows ___ light
- absorb
- reflect
- refract
- All of the above
Answer:
All of the above or absorb
Explanation:
I'm pretty sure it is absorb, because it depends what type of pillow for it to reflect.
Answer:
pillows absorb light.
Explanation:reflection would have been more like a glass mirror because the mirror reflects light.
Question attached i need answers quick
A wave that is traveling toward an interface is called the...??
Answer:
Surface wave
Eg ocean wave
You are a traffic accident investigator. You have arrived at the scene of an accident. Two cars of equal mass (1,000 kg each) were involved in a rear-end accident at a stop sign. Here is what you know: Car 1 approached the intersection from the top of a 25-meter hill. Car 2 was on a flat stretch of road directly in front of Car 1. At the bottom of the hill, Car 1 was going 20 m/s; Car 2 was going 30 m/s before it stopped at the stop sign. There were no skid marks left by Car 2. The collision occurred at the stop sign, where Car 2 had stopped. After the collision, both cars were moving together in the same direction at 10 m/s before slowly rolling to a stop. You must now push Car 2, using 800 N of force, 10 meters off to the side of the road so no one else gets hurt.
1. What was the potential energy of Car 1 at the top of the hill? (3 points)
2. What was the kinetic energy of each car before braking? (4 points)
3. A. How much energy did Car 1 lose from the top to the bottom of the hill? (3 points)
B. Where do you suppose that energy went? (2 points)
4. How much work was done to bring Car 2 to a stop? (4 points)
5. If Car 2 came to a stop in 15 seconds, how much power (in watts) did it take to stop Car 2 at the stop sign by applying force to the brakes? (3 points)
6. What is the final combined momentum of the cars right after the accident? (6 points)
7. Assuming that there are no other nonconservative forces involved, what impulse was given to each car during the collision? (6 points)
A. Car 1 (3 points)
B. Car 2 (3 points)
8. How much energy did Car 1 lose in the collision? (3 points)
9. How much energy did Car 2 gain in the collision? (3 points)
10. Which of the two laws covered in this unit - Law of Conservation of Momentum or Law of Conservation of Energy - is obeyed in this problem? Explain your reasoning. (5 points)
11. How much work did it take to move Car 2 off to the side of the road? (3 points)
12. If it took you 40 seconds to move Car 2 off the road, how much power did you expend? (3 points)
13. Which simple machine does a car have that helped you move Car 2? Explain. (2 points)
motives are activated by
A) thoughts.
B) internal physiological states.
C) external cues.
D) all of these
Answer:
D all of these gufjbihbuxhbi
Please have a look at the image
Answer:
a
Explanation:
a. zero is the answer...
Please help! I'll mark you as branliest!!! :)
Answer:
pretty sure its C, Radiation because the sun produces radiation
Explanation:
Answer: conduction
Explanation:
The sand is directly transferring heat to the people. They are touching, so it would be an example of conduction.
What do snow melting, water freezing to ice, and water boiling into steam have in
common? *
O
They involve a change in state.
They involve a change in temperature.
O
They involve a change in thermal energy.
All of the above are true.
Answer:
All of the above.
Explanation:
During which two phases would surfer’s most likely benefit
A. New and Full Moon
B. New moon and Waxing Crescent
C. Full Moon and Waxing Gibbous
D. 1st Quarter and 3rd Quarter
The phases where surfer’s most likely benefit include D. 1st Quarter and 3rd Quarter.
Surfers will benefit include during the 1st Quarter and 3rd Quarter because there's tidal change. Tidal change is when coastal areas experience two low and high tides.
The benefit of surfing during this period is that it helps jack the waves. Waves transmit energy and this is important to surfers.
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Suppose that you, with a mass of 48kg, is standing on frictionless roller skates when someone throws you a 2.50kg mass with a velocity of 15m/s and you catch it. What will be your resultant velocity?
Answer:
v = 0.74 m / s
Explanation:
We can solve this exercise using the conservation of the moment
initial instant. Before the crash
p₀ = m v
where m is 2.50 kg and its velocity v₀ = 15 m / s
final moment. After catching the dough
[tex]p_{f}[/tex] = (m + M) v
As the system is made up of the mass and the person, all the forces during the impact are internal, therefore the moment is conserved
p₀ = p_{f}
m v₀ = (m + M) v
v = m / (m + M) v₀
we calculate
v = 2.5 / (2.5 + 48) 15
v = 0.74 m / s
Which of the following are major problems with fission reactors? maintaining high temperatures disposal of hot water disposing of radioactive waste obtaining fuel
Answer:
hot water
Explanation:
Answer:
a
Explanation:
10. Which of the following types of drug use is not found in Erich
Goode's list of drug use types?
A) Legal instrumental
B) Legal recreational
C) Legal nonrecreational
D) Illegal recreational
Legal nonrecreational types of drug use is not found in Erich Goode's list of drug use types. Hence, option (c) is correct.
What is Erich Goode's list of drug use types?American sociologist Erich Goode is an expert in the sociology of deviance. He has authored a lot of books on the subject generally as well as on particular aberrant subjects. At the State University of New York at Stony Brook, he was a professor.
Goode's four drug use patterns
Legal instrumental use: Using over-the-counter and prescription medications to treat or relieve symptoms.Legal recreational use: Using legal substances (such as coffee, alcohol, or tobacco) to induce a particular frame of mindIllegal instrumental use - Using non-prescription medications to carry out an action or achieve a target.Illegal recreational use: Using illicit substances to get high or have fun.Learn more about drug, refer the link:
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With a bar magnet, where are lines of force the closest together?
A) At the tip of either of the magnet's poles
B) At a point outside the magnet halfway between the poles
C) Inside the center of the magnet
Answer:The lines of force in a magnet is closer together at the ends of a bar magnet.
Explanation:Is equally strong at the north pole when compared with the south pole. The force is weaker in the middle of the magnet and halfway between the pole and the center.
Scientists studying a region in southern Florida have noticed drastic changes in the availability of freshwater. Which of the following probably did NOT contribute to these changes? A. Several years of declining rainfall B. Decrease in the population of pond plants C. Building of new homes in the area D. Construction of a dam on the local river
Answer:
C. Building of new homes in the area
I'm not totally sure but I think this is the best answer.
