Answer:
1) It expresses the rate (top speed) at which it can move with time.
2) P = 20 W
3) h = 18 km
Explanation:
1) Power is the rate of transfer of energy.
⇒ Power = [tex]\frac{Energy(or workdone)}{Time}[/tex]
i.e P = [tex]\frac{E}{t}[/tex]
Thus a car's engine power is 44000W implies that the engine of the car can propel the car at this rate. This expresses the rate (top speed) at which it can move with time.
2) m = 400g = 0.4 kg
t = 20 s
h = 100m
g = 10 m/[tex]s^{2}[/tex]
P = [tex]\frac{mgh}{t}[/tex]
= [tex]\frac{0.4*10*100}{20}[/tex]
= [tex]\frac{400}{20}[/tex]
P = 20 W
3) u = 600 m/s
g = 10 m/[tex]s^{2}[/tex]
From the third equation of free fall,
[tex]V^{2}[/tex] = [tex]U^{2}[/tex] - 2gh
V is the final velocity, U is the initial velocity, h is the height.
0 = [tex](600)^{2}[/tex] - 2 x 10 x h
0 = 360000 - 20h
20h = 360000
h = [tex]\frac{360000}{20}[/tex]
= 18000
h = 18 km
The maximum height of the bullet would be 18 km.
What is the average velocity of Runner C for the first 15 seconds? Question 5 options: 1.3 m/s -2.7 m/s -1.3 m/s 2.7 m/s
Answer:
2.7 m/s
Explanation:
Took the test and got 100%
how will you include physical fitness in your life?
Answer:
I get up at 5 in the morning exercise then take a shower then go back to sleep till it's time to eat breakfast and go to school. Then at 7 or 8 o clock pm after i eat dinner at 5 i exercise at 7 then take a shower and then go to bed i do this everyday.
Explanation:
Getting off the couch or out of your seat to start walking, running, bicycling, swimming or other activity may help you lead a healthier and happier life. ... Those activities can include walking briskly, gardening, bicycling slowly or even ballroom dancing.
Help please, ASAP :)
Answer:
c
Explanation:
there is only 1 carbon atom in the baking soda
hope this helps
Which kind of force(s) cause acceleration?
Group of answer choices
balanced
unbalanced
Answer:
Unbalanced forces cause acceleration.
Explanation:
They cause acceleration because one force is less or more in Newtons than the other force.
For example, let's say we have a cardboard box on the floor with no friction.
If one force is pushing the box to the right with 50 Newtons, and the second force is pushing the box to the left with 0 Newtons, the box would accelerate to the RIGHT because the forces are UNBALANCED.
A 5kg box rests on a table. a 3 kg box rests on top of the 5 kg box. what is the normal force from the table?
a. 19.6 n
b. 29.4 n
c. 49 n
d. 78.4 n
==> The total mass resting on the table is (5 kg + 3 kg) = 8 kg.
==> The total weight of that mass is (8 kg) x (9.8 m/s) = 78.4 newtons
==> The boxes are stacked. So the table doesn't know if the weight on it is coming from one box, 2 boxes, 3 boxes, or 100 boxes in a stack. The table only knows that there is a downward force of 78.4 newtons on it.
==> The table stands in a Physics classroom, and it soaks up everything it hears there. It knows that every action produces an equal and opposite reaction, and that forces always occur in pairs.
Ever since the day it was only a pile of lumber out behind the hardware store in the rain, the table has known that in order to maintain the good reputation of tables all over the world, it must resist the weight of anything placed upon it with an identical upward force. This is the normal thing for all good tables to do, up to the ultimate structural limit of their materials and construction, and it is known as the "normal force".
So the table in your question provides a normal force of 78.4 newtons. (d)
3. What is the difference between Synthetic Oil, Semi-Syntheic oil (Blend), High milage motor oil, and conventional motor oil?
Answer:
When evaluating synthetic blends, it's helpful to define the terms “synthetic blend” and “semi-synthetic”. Generally speaking, synthetic blends and semi-synthetic refer to the same thing: an oil that uses a combination of conventional and synthetic base oils in its formulation.
Explanation:
If I hold a ball on my hand. Which force is stronger, my hand or gravity?
Answer: Your hand i think
Explanation: because if grvity was stronger then you would not be able to lift your hand and the ball.
What is power?
1. Power is the distance an object is moved.
2. Power is the speed that an object is moved at.
3. Power is the amount of work done in a certain period of time.
4. Power is the distance an object is moved and how quickly it is moved.
Answer:
3
Explanation:
Im not that sure but I think its close... [srr]
Answer:
3. Power is the amount of work done in a certain period of time.
Explanation:
All changes
5. What is the major difference between the Bohr model and the currently accepted atomic
model?
O Bohr assumed that electrons could be found within an electron cloud.
O Bohr assumed that electrons move in fixed orbits.
Bohr assumed that the nucleus was positive.
Bohr assumed that electrons have very little mass.
What is the mass of an object that requires a force of 4,900 Newton's to accelerate 7 m/s/s
Answer:
Explanation:
Formula
F = m * a
Givens
F = 4900
a = 7 m/s^2
Solution
4900 = m * 7 Divide by 7
4900/7 = m
700 kg = m
help fast plsss ! which statement is true for nuclear reactions but not for chemical reactions?
Answer:
B
Explanation: a chemical reaction is only the rearrangement of electrons where a nuclear reaction actually changes the elements and thus the nuclei
Answer:
The nuclei of the atoms are changed by the reaction.
Explanation:
Just took the test.
Take the direction of east to be positive and west to be negative.
What is the average acceleration of a jet ski that goes from rest (0 m/s) to 12 m/s east in 3 seconds? Remember: acceleration is the change in velocity divided by time.
A. +4 m/s2 E
B. -4 m/s2 E
C. +0.25 m/s2 E
D. -0.25 m/s2 E
A
hope this helped anyone good luck!!!!
Answer:
Its -4m/s^2 I just took the test
Explanation:
PLEASE HELP 10 POINTS!!!
The best thermal insulators _____________________.
have free electrons.
are metals.
conduct heat well.
are gases.
Answer:
The best thermal insulators HAVE FREE ELECTRONS
1. A baseball that has been thrown is travelling at 40m/s. If
the ball has a mass of 0.142kg, how much kinetic energy
does it have?
2. If a similar baseball was hit and travelled at 52m/s and
had 196J of kinetic energy, what is the mass of that
baseball?
3. A 4kg shot put is thrown and it has 288J of kinetic energy.
What is the mass of the shot put?
Answer:
See explanations below
Explanation:
1) KE = 1/2mv²
mass m = 0.142kg
v = 40m/s
KE = 1/2 * 0.142 * 40^2
KE = 1/2 * 0.142 * 1600
KE = 800*0.142
KE = 113.6Joules
2) KE = 1/mv^2
KE = 196
mass m = ?
velocity v = 52m/s
Substitute
196 = 1/2*m*52²
196 = 1352m
m = 196/1352
m = 0.145kg
Hence the mass of the baseball is 0.145kg
3) KE = 1/2mV^2
288 = 1/2 * 4v²
288 = 2v²\
v² = 288/2
v² = 144
v = 12m/s
The velocity of the shotput is 12m/s
What is the pressure exerted by an elephant who weighs 2500N and whose feet cover an area of 7.5m2?
Answer:
0.00339905404
Explanation:
kg: 0.00339905404
pascals: 333.333333
pounds: 0.0483459126
A team of students uses a Bunsen burner to heat a beaker full of ice and uses a thermometer to measure the temperature of the sample as it heats. Their data indicate that the ice maintains a constant temperature of 0°C. Which of the following could be occurring? Select all the options that apply.
Answer:
1. The ice molecules are at a temperature of 0°C;
2. The ice molecules are absorbing latent heat which would result in their turning to liquid water. Therefore, melting or fusion is occurring.
Note: The question did not provide any options to choose from.
Explanation:
The process of change of state occurs when heat is added or removed from a substance. For example, solid may change to a liquid when heat is added to it whereas a liquid may change to liquid when heat is removed from it.
During the process of change of state, the temperature of the substance undergoing a change of state does not change throughout the time it is undergoing the change. The temperature will begin to increase or decrease when all the molecules of the substance has undergone a change of state. The heat supplied to or removed from a substance during a change of state is known as latent heat.
When a solid changes to liquid, it is known as fusion and the heat absorbed by the solid substance is known as latent heat heat of fusion. If a liquid changes to gas, it is known as vaporization and the heat absorbed by the liquid is known as latent heat of vaporization.
In the experiment by the students above, since the temperature of the ice remains constant at 0°C when heat is supplied from the Bunsen burner to it, the following processes could be occurring:
the ice is at a temperature of 0°C;the ice molecules are absorbing latent heat which would result in their turning to liquid watermelting or fusion is occurringAnswer: B, C, D
Explanation:
trust me
HELP PLEASE!!!
Gravity helps us watch television, talk on the phone, and use the Intemet.
Explain whether this statement is true or false.
Support your answer with evidence from the text.
Answer:
Technically yes, it does help those objects not to float away, but that is false. gravity is not the factor that lets us watch tv, talk on the phone etc.
Gravity helps us watch television, talk on the phone, and use the Internet. This is true statement.
What is the process of satellite orbiting?The goal of satellites is to achieve balance. They rotate around the globe quickly enough to avoid being entirely drawn down into the planet's center of gravity, yet slowly enough to avoid drifting out into space.
When a satellite is travelling at the right speed, the earth's gravitational attraction is just strong enough to keep it in place. A satellite must move quicker to maintain orbit the nearer it is to the earth's surface. Additionally, satellites' orbits are circular or elliptical due to the continual pull of the curved surface of the planet.
Therefore, gravity plays a crucial role in our daily lives, whether it's keeping us anchored to the planet's surface or keeping the satellites we use to communicate and learn more about our environment in orbit.
Learn more about satellite here:
https://brainly.com/question/9266911
#SPJ2
John attached a ball to a spring
Answer:
C down
Explanation:
The ball is pulling the spring down so this must be the direction of the force
find the force on an object which has the mass of 20kg and an acceleration of 10m/s
Answer:
200 Newtons
Explanation:
20 kg x 10 m/s squared
What are the determinants for potential energy?
if wave A has three times the amplitude of wave B, then wave A will have nine times the energy as wave B
TRUE OR FALSE?
30 POINTS
Answer:
true
Explanation:
Answer:
True
Explanation:
I finished the test not too long ago. Lol.
If the horse lifts a 50 kilogram mass a vertical distance of 3 meters in 2 seconds, what is the horse’s minimum power output?
T= 2s
d= 3s
m= 50kg
Answer:
735watts
Explanation:
Power = Force*distance/time
Given
Force = mg = 50 * 9.8'
Force = 490N
distance = 3m
time = 2s
Substitute
Power = 490*3/2
Power = 1470/2
Power = 735Watts
Hence the minimum power output is 735watts
What is the weight of a pumpkin with a mass of 5 kg? kk
Explanation:
actually, the question would need to give you what is the gravitational force, so let's take the average of the gravitational for me which is 10 N /kg
and the formula for finding weight is
W = mg
W = (5)(10)
W = 50 N
hope it is helpful, if not please report it so that someone else gets to try
please vote
what moon phase will occur about 14 days after a first quarter?
Answer:
waxing gibbous is the answer.
Which mass extinction occurs the slowest?
A. Asteroids
B. Climate Change
C. Volcanic Eruption
Answer:
B. climate change
Explanation:
asteroids are too big and volaconos are probably gonna create a lot of smoke that can kill ya in seconds so I guess climate change
what's electron affinity? and what is the formula of electric current?
Answer:
Electron affinity is the energy change that results from adding an electron to a gaseous atom. For example, when a fluorine atom in the gaseous state gains an electron to form F⁻(g), the associated energy change is -328 kJ/mol.
Give brainliest please.
Answer:
Electron affinity is the energy change that results from adding an electron to a gaseous atom.
Sorry I don't know about the second one.
You push a box at a constant speed of 5m/s and let it go. It stops 1.5s later due to the force of friction. If you push the box at a speed of 12m/s, how long will it take to stop?
Answer:
the time taken for the box to stop is 3.6 s.
Explanation:
Given;
initial speed with which the box was pushed, u = 5 m/s
time taken for the box to stop, t = 1.5 s
Assuming the box is moving at constant acceleration, a;
[tex]a = \frac{u}{t} \\\\a = \frac{5}{1.5} \\\\a = 3.33 \ m/s[/tex]
When the box is pushed a speed of 12 m/s, the time taken for the box to stop is calculated as;
[tex]t = \frac{v}{a} \\\\t = \frac{12}{3.33} \\\\t = 3.6 \ s[/tex]
Therefore, the time taken for the box to stop is 3.6 s.
Which type of electromagnetic waves has the shortest wavelength?
The answer is Ultraviolet
Answer:
Gamma Rays .
Explanation:
Answer:
the answer is uv
Explanation:
What distinction is made between triglycerides and carbohydrates or proteins?
A.
Triglycerides store less energy than carbohydrates or proteins.
B.
Carbohydrates and proteins are unlikely to cause heart disease, but triglycerides do.
C.
Carbohydrates and proteins are more important to a healthy life than triglycerides.
D.
Triglycerides store more energy than carbohydrates or proteins.
Answer:
C.
Carbohydrates and proteins are more important to a healthy life than triglycerides.
Sorry if it wrong.
Explanation:
when a electric current is passed through an insulated wire that is coiled around an iron core like a nail what is created?
electromagnet
When a electric current is passed through an insulated wire that is coiled around an iron core, like a nail, an electromagnet is created.