Answer:
a) The work done in raising the block up to 2.0 m is 137.2 joules
b) The power exerted by the string in pulling the box up the ramp is 68.6 watts
Explanation:
The question examines the relationship between work energy and power
The parameters of the pulled box are;
The mass of the box, m = 7.0 kg
The height to which the box is pulled, h = 2.0 m
The velocity at which the box is moving at the 2.0 m height = 6.0 m/s
The time if takes the box to reach the height of 2.0 m = 2.0 seconds
The acceleration due to gravity, 'g' is taken as approximately 9.8 m/s²
a) The work done in raising the block up to 2.0 m = The potential energy gained by the block
The potential energy gained by the block, P.E. = m·g·h
Therefore, we have;
The work done in raising the block up to 2.0 m = P.E. = m·g·h
By substituting the given values, we get;
The work done in raising the block up to 2.0 m = 7.0 kg × 9.8 m/s² × 2.0 m = 137.2 joules
b) Power = The rate of doing work
∴ Power, P = Work done/(Time takes for the work)
The work done in raising the block up to 2.0 m = 137.2 joules
The time if takes the box to reach the height of 2.0 m = 2.0 seconds
∴ The power exerted by the string in pulling the box up the ramp, 'P' is given as follows;
P = 137.2 joules/(2.0 seconds) = 68.6 watts
The power exerted by the string in pulling the box up the ramp, P = 68.6 watts.
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:
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:
A toy car is placed at 0 on a number line. It moves 9 cm to the left, then 4 cm to the right, and then 6 cm to the len
What is the total distance the toy car traveled?
O 1 cm
O 5 cm
O 11 cm
O 19 cm
Answer:19 cm
Explanation:
Answer:
19 cm
Explanation:
4. A car accelerating at 60 meters/second is hit in an accident by a bus. The net force exerted on
the car is 30000 Newtons. What is the car's mass?
Answer:
500kg
Explanation:
mass = newtons/force divided by the acceleration rate
m = 30,000/60
m = 500
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.
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 the magnitude of the eletrostatic force on an electron by another electron when they are 0.10 meter apart?
Answer:
[tex]F=2.30\times 10^{-26}\ N[/tex]
Explanation:
The distance between two electrons, d = 0.10 m
We need to find the magnitude of the electrostatic force on an electron by another electron.
The electrostatic force between two charges is given by :
[tex]F=k\dfrac{q_1q_2}{d^2}[/tex]
Substitute all the values,
[tex]F=\dfrac{9\times 10^9\times (1.6\times 10^{-19})^2}{(0.1)^2}\\\\F=2.30\times 10^{-26}\ N[/tex]
So, the magnitude of the electrostatic force between two electrons is [tex]2.30\times 10^{-26}\ N[/tex].
It is a force imposed by one charge on another as a result of the field. The magnitude of the electrostatic force will be 2.30×10⁻²⁶N.
What is the electrostatic force?
It is a force imposed by one charge on another as a result of the field. The electrostatic force produced by one line charge on another line charge is inverse of the square of the radius.
The electrostatic force is determined by the charge potency of each charge as well as the separation distance between them.
The given data in the problem is;
q=q₁=q₂ is the electric charge = 1.6×10⁻¹⁹C
r is the distance between the two charge=0.10 m
The formula for the electrostatic force is given by;
[tex]\rm F=\frac{ Kq_1q_2}{r^2} \\\\ \rm F=\frac{ 9\times 10^9 \times(1.6\times 10^{-19})^2}{(0.1)^2}\\\\ \rm F =2.30 \times 10^{-26} \ N[/tex]
Hence the magnitude of the electrostatic force will be 2.30×10⁻²⁶N.
To learn more about the electrostatic force refer to the link;
https://brainly.com/question/9774180
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
Help please, ASAP :)
Answer:
c
Explanation:
there is only 1 carbon atom in the baking soda
hope this helps
About how long does it take for the moon to go from new moon to full moon?
Answer:
1 month
Explanation:
It takes our Moon about 29.5 days to complete one cycle of phases (from new Moon to full Moon).
Please help !! I have no clue how to do this
Answer:
THIS IS SUPER EASY!!!!!!
BOLD = ANSWER
Explanation:
REMEMBER: force = mass x acceleration
4. 6.0kg x 4.0m/s2 = 24N
5. 7.5kg x 8.3m/s2 = 62.25N
6. 2,000kg x 8.3m/s2 = 16,000N
REMEMBER: mass = force / acceleration
7. 6.0N / 3.0m/s2 = 2kg
8. 6.0N / 12.0m/s2 = 0.5kg
9. 20.0N / 5.0m/s2 = 4kg
10. 20.0N / 2.0m/s2 = 10kg
11. 4.0N / 7.3m/s2 = 0.55kg
12. 4.6N / 16.3 m/s2 = 0.28kg
I hope this helps u! :D
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:
Norma drives her car for 150 min at 40 km/h, then rests for 75 min, and then drives for 3.15 h at 60 km/h. What was Norma’s average speed?
Answer:
Norma’s average speed is 41.9 km/h.
Explanation:
The average speed is given by:
[tex] \overline{v} = \frac{d_{T}}{t_{T}} [/tex]
Where:
[tex]d_{T}[/tex]: is the total distance
[tex]t_{T}[/tex]: is the total time
We can find the total distance as follows:
[tex] d_{T} = v_{1}*t_{1} + v_{2}*t_{2} = 40 \frac{km}{h}*150 min*\frac{1 h}{60 min} + 60 \frac{km}{h}*3.15 h = 289 km [/tex]
Now, the total time is:
[tex] t_{T} = t_{1} + t_{2} + t_{3} = 150 min*\frac{1 h}{60 min} + 75 min\frac{1 h}{60 min} + 3.15 h = 6.9 h [/tex]
Hence, the average speed is:
[tex] \overline{v} = \frac{d_{T}}{t_{T}} = \frac{289 km}{6.9 h} = 41.9 km/h [/tex]
Therefore, Norma’s average speed is 41.9 km/h.
I hope it helps you!
Which of the following will increase if the voltage in a circuit is increased?
Check all that apply.
A. Heat produced by the circuit
B. Magnetic force
C. Resistance
D. Current
Answer:
D. Current
I hope this helps
According to Mendel's law of segregation, what takes place during meiosis?A.Pairs of alleles cross over on chromosomes, exchanging one for anotherb.Pairs of alleles separate in meiosis, and each gamete receives one allele of a pairc.Part of an allele is separated, or broken off, from its chromosomed.One chromosome is suppressed, and the other chromosome of the pair determines the traits of the offspring
Answer:
b. Pairs of alleles separate in meiosis, and each gamete receives one allele of a pair.
Explanation:
Gregor Mendel, who is referred to as the FATHER OF GENETICS because of his contribution to the principles of inheritance, proposed in one of his laws called LAW OF SEGREGATION that the alleles of a gene will separate into gametes in such a way that only one of the two alleles that make up a gene will be in each gamete.
This division/separation of alleles during gamete formation is called MEIOSIS. Note that, allele is one member of a gene. Hence, according to Mendel, in meiosis, pairs of alleles separate and each gamete receives one allele of a pair.
A car is traveling in a race.The car went from the initial velocity of 35 to the final velocity of 65 in 5 seconds what is the acceleration
Answer:
Acceleration = 6m/s²
Explanation:
Given the following data;
Initial velocity = 35m/s
Final velocity = 65m/s
Time = 5 seconds
To find the acceleration;
In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.
This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.
Mathematically, acceleration is given by the equation;
[tex]Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}[/tex]
Where,
a is acceleration measured in [tex]ms^{-2}[/tex]v and u is final and initial velocity respectively, measured in [tex]ms^{-1}[/tex]t is time measured in seconds.Substituting into the equation, we have
[tex]a = \frac{65 - 35}{5}[/tex]
[tex]a = \frac{30}{5}[/tex]
Acceleration = 6m/s²
what moon phase will occur about 14 days after a first quarter?
Answer:
waxing gibbous is the answer.
While playing a video game on your laptop, the laptop gets very hot. Which Thermodynamics Law does this exemplify?
Answer
The dedicated graphics card is used when performing hardware-intensive tasks so as to ensure efficiency and balanced performance. However, it uses more power and thus produces more heat. When the cooling system is not sufficient or the room is not well ventilated, your PC begins to overheat while playing games. Explanation: How does the second law of thermodynamics relate to the direction of heat flow? Heat of itself never flows from a cold object to a hot object. ... The second law expresses the maximum efficiency of a heat engine in terms of hot and cold temperatures. one of these answers i am not sure
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.
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
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
Attraction and repulsion are both forces that act over a distance without objects having to touch. Choose the statement below that best describes what happens when objects attract or repel without any outside force to interfere in their motion.
a
When objects attract or repel the motion depends the type of attracting or repelling that is happening.
b
When objects attract they pull each other together and when they repel the push each other apart.
c
When objects attract they push each other apart and when they repel they pull each other together.
d
When objects either attract or repel it's mostly the same thing.
answer:
b. when objects attract they pull each other together and when they repel the push each other apart.
explanation:
repel means to push each other apart (south vs south pole)attract means to pull each other (north vs south pole)like poles repel, while opposite poles attractYou 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.
What happens to the molecules when the solid changes phase?
they begin to move quickly and can break away from other molecules
Answer:
When solid changes atoms/molecules begin to speed up and move around. Compared to when they are in the solid phase, where they barely move and are slow and are compacted.
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
Which point on the standing wave will not move?
Answer:
B
Explanation:
A P E X
Which type of electromagnetic waves has the shortest wavelength?
The answer is Ultraviolet
Answer:
Gamma Rays .
Explanation:
Answer:
the answer is uv
Explanation:
Review the following situations and determine whether each is an elastic collision or an inelastic collision. Choose the situations that are elastic collisions. Select all that apply.
A. Momentum is conserved; kinetic energy is not.
B. A moving hockey puck strikes one at rest; the objects exchange velocity.
C. Momentum and kinetic energy are conserved.
D. A collision between a volleyball and a basketball occurs; there is no deformation.
E. After a collision, objects are stuck together, moving together.
Answer:
Your answer would be D.
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.
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
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