Answer: 3.5 kWh
Explanation:
Given that the
Power P = 500 W
To convert watt to kilowatt, divide it by 1000
Power P = 500/1000 = 0.5 kw
Time t = 7 hours
Power is the rate at which work is done. That is,
P = WD/t
Cross multiply
WD = Pt
Where workdone WD is the energy E consumed in kWh .
Substitute P and t in the formula above.
E = 0.5 × 7
E = 3.5 kWh
Therefore, 3.5 kWh (kilowatt hours) of electricity is consumed by a 500 w light bulb that burns.
On February 6, 1971, Alan Shepard made history by becoming the first astronaut to play golf on the Moon. Using only one hand to swing the club because of his bulky space suit, Shepard still managed a long drive. Given the lack of an atmosphere on the moon and a gravitational acceleration of 1.6 m/s2, how far would the shot go with an initial velocity of 25 m/s and a launch angle of 35∘?
A. 367 m
B. 375 m
C. 382 m
D. 391 m
Answer:
Horizontal distance travelled by the ball.
A. 367m
Explanation:
Projectile motion is a motion in which an object moves in a parabolic path due to the action of gravity on it. Projectile motion only occurs when there is one force which is applied at the beginning, after that the only interference is from gravity. e.g the path of a golf ball after hit by a golfer.
Range of the projectile can be defined as the horizontal distance given by the ball. We need to find Range in this question.
The Range of a projectile is given by:
[tex]R = \frac{v^2\cdot{sin2}\theta}{g}[/tex]
where
v = initial velocity = 25 m/s
θ = 35°
g = 1.6 m/s²
Substitute the values in formula of R:
[tex]R= \frac{(25)^2\cdot{sin(2\cdot35)}}{1.6}\\R= \frac{(625)\cdot{sin(70)}}{1.6}\\R=367m[/tex]
A horizontal force of 50 N is applied to the object.
Answer:
Mass of object (m) = 5.102 kg
Explanation:
Given:
Horizontal Force (F) = 50 N
Find:
Mass of object (m) = ?
Computation:
We know that, acceleration due to gravity (g) = 9.8 m/s²
⇒ Horizontal Force (F) = mg
⇒ 50 N = m (9.8 m/s²)
⇒ Mass of object (m) = 50 / 9.8
⇒ Mass of object (m) = 5.102 kg
Mass of object (m) is 5.1 kg (Approx)
NEED HELP ASAP!!!!!!!!!!!!!
Which of the following is NOT a side effect of smoking:
Decreased ability to use oxygen
Decreased lung function
Decreased risk of heart attack
Increased asthmatic symptoms
Answer: Decreased risk of heart attack
Explanation:
thats the answer because it actually
increase rish of heart attack
Hope this helps :)
Answer:
the answer is C. It wont decrease your probability of a heart attack it will increase it
Explanation:
Which of the following atoms has the smallest radius?
The Periodic Table
pls help quickly average velocity = u+v/2 or displacement/ total time taken
Answer: Average velocity = u+v/2
Explanation: The definition of velocity is displacement over time taken. That is,
Velocity = displacement/ time taken
But we have initial velocity U and final velocity V. When we are talking about average, we are talking about the mean value of the given parameters.
Therefore, average velocity will be addition of initial velocity and final velocity divided by 2. That is,
Average velocity = (U + V)/2
Complete the sentences to describe the postulates of Einstein’s special theory of relativity.
Einstein’s special theory of relativity has two postulates.
The first postulate states that the laws of physics are the
answer: same
in all uniformly moving reference frames.
The second postulate states that the speed of light in a vacuum has the same value for all
answer: observers
, regardless of the state of
answer: motion of the observer or the source of light.
I am posting for others... feel free to take the points
Answer:
awwh thanks for the free points
The special relativity hypothesis is accepted by all physicists. Even our satellites in orbit must synchronize their clocks and transmissions with those on Earth using Einstein's calculations.
What Einstein’s special theory of relativity?According to special relativity, speed has an impact on space, time, and mass. Small amounts of mass (m) can be interchangeable with vast amounts of energy (E), as indicated by the classic equation E = mc2. This method of defining the link between energy and matter is included in the theory.
Therefore, The relationship between speed, mass, time, and space is described by Einstein's special relativity theory. It describes the equation e=mc2, which asserts that energy is equal to mass times the square of the speed of light.
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The electromagnetic waves with the most energy have the greatest
period
b) wavelength
c)
frequency
d) color
Frequency is the amount of times the particle moves back and forth per second, more or less. The more energy, the higher the frequency. At the same time, the more energy means you'll have a shorter wavelength (aka period). Color only applies to the visible spectrum.
Answer:
frequency
Explanation: The greater the number of waves appear the greater the energy. The smaller the number of waves appear the lower the energy.
Frequency is the number of times waves appear.
A frictionless roller coaster (22kg) is at a height h traveling with a speed v0 = 10m / s. Assume that h = 20m. The speed of the car at point B is:
Answer:
3 g
Explanation:
Four identical 2.5 mF capacitors are connected together electrically. What is the greatest possible capacitance of the combination? 0.50 mF, 0.42 mF, 0.63 mF, 10 mF, or 0.40 mF?
When capacitors are in PARALLEL, they add up. (like resistors in series)
If you connect these four capacitors in parallel, the combination behaves like a single capacitor of (4 x 2.5) = 10 mF.
That's the greatest capacitance you can make with these four pieces.
When an object rolls over a surface, the kind of friction that occurs is called
friction.
Answer here
Answer:
Rolling Friction
Explanation:
But only write rolling on the blank space
Answer:I miss her
Explanation:
Steroid use in females can cause masculine characteristics, such as lower voice and increased body hair." True False
Answer:
True
Explanation:
Side affects can range from
Problems with periods to Loss of breasts
3. What are two common effects of driving on open highways?
A. Speeding and highway hypnosis
B. Fatigue and visual effects
C. Velocitation and fatigue
D. Velocitation and highway hypnosis
Answer:
Explanation:
Special problems: Rural areas can be twice as dangerous as their city counterparts. ... Two common effects of driving on open highways are velocitation and ... Avoid speeding on rural roads or after you exit the freeway by checking your ... for a long period of time, be aware of a condition known as "highway hypnosis".
Driving on wide highways frequently results in velocitation and tiredness. The phenomena of accidentally raising speed on roads as a result of repeated exposure to greater speeds is known as velocitation.
It happens when drivers become acclimated to the faster speeds and may unintentionally go over the speed limit, endangering their safety.
Another frequent impact is fatigue, which can occur as a result of extended lengths of repetitive driving on wide-open highways. Fatigue can make it difficult to focus, respond quickly, and make decisions, which makes accidents more likely.
Despite the fact that highway hypnosis and visual effects can also happen when driving, open roads are uniquely linked to velocitation and weariness.
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hi:) anyone able to explain why it’s easier to lift something on moon compared to earth? thanks:)
Because the moon has much less mass than the Earth has. This makes the gravitational forces between the moon and any object much less than the forces between the Earth and the same object, when the object is the same distance from the center of the moon or the Earth.
To talk about an actual number, we usually talk about being on the surface of the Earth or the moon:
A person or object on the surface of the moon weighs about 17% as much as he/it weighs on the surface of Earth. That's about one-sixth as much. So naturally, it's easier to lift something on the moon than it is to lift the same thing on Earth, because when it's on Earth, it's about six times as heavy.
In the table below, which statement would best fill the missing box under “Closed System”? Open System Closed System Matter freely moves Matter does not freely move Energy freely moves Energy is unknown Energy is destroyed Energy does not freely move Energy freely moves
Answer:
energy moves freely
just guessing
Answer:
C: Energy does NOT move freely
Explanation:
a closed system does not allow energy to flow, open systems do.
Which statements accurately describe the motion map?
Check all that apply.
-The objects are moving in the same direction
-The objects are moving in opposite directions.
-Object A has a greater velocity than object B.
-Object B has a greater velocity than object A.
-Objects A and B have the same velocity
Answer: B & D
Explanation:
The objects are moving in opposite directions is the statements accurately describe the motion map, therefore the correct answer is option B
What is displacement?An object's position changes if it moves in relation to a reference frame, such as when a passenger moves to the back of an airplane or a professor moves to the right in relation to a whiteboard. Displacement describes this shift in location.
It is a vector quantity to be displaced. This means that it is visually represented as an arrow that points from the starting position to the ending position and that it has both a direction and a magnitude.
The total distance traveled by an object is different than the total displacement covered by it because the displacement is a vector quantity and it is calculated on the basis of the shortest distance traveled by the body or object.
Thus, The objects are moving in opposite directions is the statements accurately describe the motion map, therefore the correct answer is option B
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An airplane flies 40km directly south in 10 minutes and 20 km directly east in five minutes, its average speed is:
a)2.98km/min
b)2km/min
c)8km/min
d)4km/min
Answer:
D. 4km/min
Explanation:
Since the question deals with "speed" and not "velocity", the direction does not matter.
the plane covers 40 + 20 km=60km in 10mins +5 mins=15mins
60 km - 15 mins
1min- 60÷15= 4 mins
therefore, your answer is D. 4km/min
As an object falls to the ground, what happens to its energy? Ignore air resistance in this scenario.
A)energy is converted from gravitational potential energy to kinetic energy.
B)energy is converted from kinetic energy to
gravitational potential energy.
C)energy is in motion the whole time.
D)energy gets destroyed due to friction
Answer:
the answer is a
Explanation:
due to it being high and kenetic is in motion
When the object falls to the ground so the option A should be considered for energy.
Impact on energy:In the case when the object falls to the ground, so here the energy should be transformed from the gravitational potential energy to the kinetic energy as both are considered since the objects fallen into the ground.
Learn more about the energy here: https://brainly.com/question/19119593
A net force of 400 Newtons acts on a 50kg mass. What is its acceleration?
A 450 m/s/s
B 8 m/s/s
C20,000 m/s/s
D 350 m/s/s
E.125 m/s/s
Explanation:
Formula = F = ma
Where f is force m is mass and a is acceleration
400 = 50a
400/50 = a
8
Option B is the correct answer
Answer:
the answer is B
Explanation: because, force=mass x acceleration, which acceleration=force : mass.
So, acceleration= 400 : 50=8m/s/s :D
If 400j of work is done on an object in 8 seconds, how much power does the object experience?
50w
45W
60W
408
Answer:
50w
Explanation:
Power is equal to Energy divided by Time
∆E/t
Answer:
50 W
Explanation:
Power can be found using the following formula.
p=w/t
where w is work and t is time.
400 Joules of work is done on the object in 8 seconds. Therefore,
w= 400 J
t= 8 s
Substitute these values into the formula.
p=400 J/ 8 s
Divide 400 by 8
p=50 J/s
Add appropriate units. In this case, power uses Watts, or W. (1 Joule per second, or J/s is equal to 1 Watt, or W)
p= 50 W
The object experiences 50 Watts of power
GIVING BRAINIEST TO CORRECT ANSWER
If you sit close to a campfire, the fire warms you. Describe how thermal energy is transferred from the fire to you.
Answer:
Explanation:
When you sit by a campfire, most of the heat you are receiving from the fire does not come from hot air. ... This radiation carries energy which is converted to heat when it hits another object and is absorbed. In contrast, conduction involves the direct movement of heat through an object.
Which of the following is the most effective relaxation technique?
A.
It varies from person to person.
B.
Deep breathing
C.
Eating right
D.
Exercising
Answer:
A
Explanation:
It varies from person to person.
Answer:
A.
It varies from person to person.
Explanation:
i just look the test
A tungsten-filament lightbulb emits light based on the temperature of the
filament. Which phenomenon does this demonstrate?
A. Photoelectric effect
B. Blackbody radiation
C. Quantum mechanics
D. Emission spectra
Is there gravity in space. True False
True. There IS gravity in space. Tons of it.
Michael is the captain of his school's soccer team. What skill does Michael exhibit when he decides which player will take the penalty kick?
A.
conflict resolution
B.
sportsmanship
OC.
leadership
D.
teamwork
What is the connection between the force it take to move an object of different masses?
Answer:
Gravity affects weight, it does not affect mass. MASSES ALWAYS REMAIN THE SAME. Newton's Second Law of Motion: Force = mass x acceleration The acceleration of an object is: a) directly proportional to the net force acting on the object
hope this helps u stay safe
Explanation:
What recommendations would you give to the global governments to help decrease the global effects of human impact on the environment? List 2 recommendations and how they will positively impact our planet.
Answer:
he scientific and political arguments surrounding the health of our planet can make the whole topic seem beyond the grasp of the individual. How fast is the climate changing? Exactly what effect to humans have? And what will the government do about it?
How we treat Earth also involves trillions of little decisions by billions of individuals.
That in mind, on this Earth Day, LiveScience presents 10 ideas for saving energy and otherwise cutting down on your impact on the planet. The list was compiled by the Earth Day Network organization and republished here with permission
hope this helps u stay safe
Answer:
promote green energy.
Explanation:
which of the following best describes a mathematical wave
A: A transfer of energy
B: A movement of matter
C: When energy is converted from one form to another
D: A periodic disturbance of a medium
Answer: D:
A periodic disturbance of a medium
Explanation:
A wave can be Mathematically defined by periodic disturbance of a medium. That is, oscillations of the waves about a fixed position or change in position from the resting equilibrium position. The wave oscillate from equilibrium position with amplitude periodically.
What is the average temperature of the city, 89.6 Fahrenheit, on the Celsius scale?
Answer:
thrity-two degrees Celsius
Explain the process by which cell phones transmit data using energy and waves
Answer:
Radio active waves
Explanation:
It transmits it by invisible waves to connect to internet or to use wireless headphones or wireless charger.
State the section of the graph (A, B, C, or D) where the car is moving the slowest.
Explain your answer.
b) Calculate the average speed of the car over the whole journey.
100 points and brainliest
Answer:
D 15m/s
Explanation:
1)you find the speed covered in all the points e.g on speed=distance covered
time taken
a)300m\15s=20m/s
b)rest no distance covered
c)(1000-300)=700m time=(60-35)=25. 700m/25s=28m/s
d)(1200-1000)=300m time=(80-60)=20s
200m/20s=10m/s
thus the lowest speed was 10m/s at D
Average speed=average distance
average time
=1200m/80s. =15m/s