Answer:
Explanation:
Power is expressed as P = Force * Distance/time
From the formula given, the following parameters is needed to calculate power
1) Work done
2) force
3) Distance
4) Time
From the question, the given data is incomplete. We are supposed to be given the time taken to moved the chair over the distance. with the time we can easily calculate the power used up by the student.
If the hydrogen peroxide is heated to 60°C first, the catalase doesn't
work. why?
Answer:
The ideal temperature of catalase activity is 66.6 degrees Celsius, so a temperature between 60 degrees and 70 degrees should most likely release the most oxygen during the reaction.
Explanation:
What would happen if your body id exposed to the vaccum of space?
Answer:
Acute exposure to the vacuum of space: No, you won't freeze (or explode) ... Upon sudden decompression in vacuum, expansion of air in a person's lungs is likely to cause lung rupture and death unless that air is immediately exhaled.
Explanation:
A student throws a ball horizontally at the rate of 40 m/s. If the height from which the ball is thrown is 2 m, how far will the ball travel before it touches the ground? 16.33 m 16.33 m 25.56 m 25.56 m 28.29 m 28.29 m 19.54 m
Answer:
25.56 m
Explanation:
For vertical movement , initial velocity u = 0
Displacement h = 2 m
time taken = t
h = ut + 1/2 gt²
2 = .5 x 9.8 x t²
t² = .4081
t = .639 s
During this period , the ball will move in horizontal direction uniformly with velocity 40 m /s .
horizontal displacement = horizontal velocity x time
= 40 x .639 = 25.56 m
a coin is released into the air what force acts on it when it reaches its highest point
Answer:
Gravity
Explanation:
After it reaches it's highest point, it falls back down because of gravity.
Calculate the acceleration due to gravity on the planet where an 80kg astronaut weighs only 304N.
Answer:
m=w/g
80kg=304/g
g=3.8 m/s^2
Explanation:
Which was first launched during the Space Race? rover satellite space shuttle space station hurry i will mark brainliest for first to answer you have 2 min.
Answer:
A satellite.
Explanation:
I got this answer right.
The satellite was the first launched craft during the Space Race. The correct answer would be an option (B)
What was the space race?The space race was a series of technological tests between the United States and the Soviet Union in order to demonstrate dominance in spaceflight. According to an online exhibit from the National Air and Space Museum, it was an offshoot of the mid-twentieth-century Cold War, a violent worldwide war that pitted the philosophies of capitalism and communism against one another (opens in new tab).
The first goal of this "space race" was to launch an unmanned object, a satellite, into orbit around the Earth.
A satellite is an instrument that has been sent into orbit to collect data or to serve as part of a communication system.
Thus, the correct answer would be option (B) satellite was the first launched craft during the Space Race.
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A rock dropped straight down reaches a final velocity of 17.07 m/s, how far down did the rock fall?
(Can someone plz help me out and if possible give the solution on how to solve it)
Answer:
fell DOWN 14.87m
Explanation:
vf^2=vi^2+2adeltax
[(17.07 m/s)^2-(0)^2]/[2*(-9.8 m/s2)]= deltax
x=-14.87 m
fell DOWN 14.87m
While driving his pickup truck, Joe stops at a red light. When the light turns green, Joe steps on the gas
and accelerates to 16 m/s in 4 seconds. What is Joe's acceleration?
================================================
Work Shown:
The values we're working with are
[tex]v_i = 0 = \text{ initial velocity}\\\\v_f = 16 = \text{ final velocity}\\\\t = 4 = \text{ change in time}\\\\a = \text{ unknown } = \text{ acceleration}\\\\[/tex]
We'll plug those into the kinematics formula below to solve for 'a'
[tex]v_f = v_i + a*t\\\\16 = 0 + a*4\\\\16 = 4a\\\\4a = 16\\\\a = \frac{16}{4}\\\\a = 4\\\\[/tex]
Joe's acceleration is 4 m/s^2
This means that every second, Joe's velocity is increasing by 4 m/s.
---------------------------
To check our answer, we can see that
Time 0 = Velocity 0
Time 1 = Velocity 4
Time 2 = Velocity 8
Time 3 = Velocity 12
Time 4 = Velocity 16
This confirms our answer.
Look at the graph. During what interval is the object decelerating?
A) 0-1s
B)5-20s
C) 20-4
D)40-50s
Answer:
D
Explanation:
because the slope decreases
Answer:
Should be D the correct answer
Explanation:
Would ocean water cause our cells to swell with more or to shrivel ?
Answer: The cell shrinks
Explanation: Seawater is hypertonic. If you place an animal or a plant cell in a hypertonic solution, the cell shrinks, because it loses water ( water moves from a higher concentration inside the cell to a lower concentration outside ). So if you get thirsty at the beach drinking seawater makes you even more dehydrated.
Please help 25 points Add the following numbers and round your answer to the correct number of significant figures:
90.0 + 80 =
Show both the unrounded and rounded answer.
Explanation:
Wouldn't this just be 90+80 meaning the answer would be 170?
whats a neutralizer answer
Answer:
a neutralization reaction is when a action in a base react to form water and salt it also
neutralization is where and where are the acid reacts with a nuclear to form a netural soution of a salt and water
Explanation:
it involves the combination of H plus ions oh- to generate water it means when a solution is neutralized it means that salts are formed from equal weights of acid and base please mark this brainiest please
Answer:
divide 2 by 2
Explanation:
Help plz giving BRAINLIEST :) (due really soon)
Answer:
This will take me a min hold up
Explanation:
11: if the charge INCREASES then so does the force
12: x2
13: x3
14: be like x4 i think.. yeah x4
Erm table 1: 0.6N, 1.2N, 1.8N
and table 2 I think: 0.6N, 2.4 N, 5.4N
The nucleus of an atom is
charged.
Positively
Liquid
Variably
Negatively
A sprinter is running toward the finish line at 7 m/s. When he is 12 m away from the finish line, he begins to fatigue and slows at a rate of -0.6 m/s^2 . How fast is he running when he crosses the goal line? *Round your answer to the nearest hundredth.
Answer:
5.88 m/s
Explanation:
The following data were obtained from the question:
Initial velocity (u) = 7 m/s
Acceleration (a) = –0.6 m/s²
Distance (s) = 12 m
Final velocity (v) =.?
We, can determine how fast the sprinter is running when he crosses the goal line as follow:
v² = u² + 2as
v² = 7² + (2 × –0.6 × 12)
v² = 49 + (–14.4)
v² = 49 – 14.4
v² = 34.6
Take the square root of both side
v = √34.6
v = 5.88 m/s
Therefore, the sprinter is running at a speed of 5.88 m/s when he crosses the goal line.
Which of the following shapes is most similar to Earth's orbit?
A. Shape A
B. Shape B
C. Shape C
D. Shape D
The right option must be option (B).
Since the orbit of the earth is only 3% oblate, it is closer to a circle.
Kepler's Laws:According to Kepler's laws of planetary motion:
The planets each travel along an ellipse with the sun at one focus.The line joining the sun and the planets sweep out equal areas in equal time intervals.The square of the period of the revolution of the planets equals the cube of the planet's mean distance from the sun.So according to Kepler's law, it would seem that the answer must be option A. And it can be the right choice generally.
But the orbit of earth is only 3% oblate, which means it is only 3% an ellipse, so the orbit of the earth is closer to a circle. So the right option must be option B.
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Answer:
Shape B
Explanation:
Air pressure decreases as elevation increases. Describe how the boiling point of
water on top of a mountain would be different from its boiling point at sea level.
Answer:
The boiling point on top of a mountain would be lower than at sea level because the altitude would be higher and air pressure would decrease.
As the height increases, because most of the air molecules are held near to the surface and hence pressure by gaseous substance will be lower at higher altitudes results in lowering boiling point also.
What is boiling point?Boiling point of a substance is the temperature at which the substance changes from the liquid state to vapor state where both phases are in equilibrium and the pressure of vapor phase above the liquid phase will be equal to the atmospheric pressure.
The boiling point is dependent on the bond type, molecular weight, temperature and pressure. At higher altitudes, the pressure will be reduced due to the less denser air.
The volume of gas molecules is higher on elevation and thus, a decreased pressure causes, the water molecules easily boil with weekend intermolecular force thus, boiling point at mountain will be less than that at sea level.
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Pls help I am very confused science
Answer:
plant cell
Explanation:
because it has chloroplast
A roller coaster, traveling with an initial speed of 15 meters per second, decelerates uniformly at 7.0 m/s/s to a full stop. Approximately how far does the roller coaster travel during its deceleration?
Start
Finish
8 min
Time
0 min
1 min
2 min
3 min
4 min
5 min
6 min
7 min
Temperature
90°C
83°C
78°C
73°C
68°C
64°C
60°C
57°C
54°C
O 45 degrees celsius/min
O 450 degrees celsius/min
O 4.5 degrees celsius/ min
O 0.45 celsius/min
hos
someone help please-
Answer:
Explanation:
light gets energy from the battery,
battery gets energy from the generator
flywheel gets energy from the crank
What can all waves travel through?
Answer:
The ocean
Explanation:
A runner begins running from rest (0 m/s) with an acceleration of 2 m/s? What is the
speed of the runner 5 seconds later?
Answer:
10
Explanation:
U=0
V=?
a=2
times=5
a=(v-u)÷t
2=(x-0)÷5
10=x-0
10ms^-1=x
Answer:
10 m/s
Explanation:
Multiply 2 m/s by 5.
1 second: 2 m/s
2 seconds: 4 m/s
3 seconds: 6 m/s
4 seconds: 8 m/s
5 seconds: 10 m/s
This can also be solved by y=mx+b, where y is speed, m is the m/s, so 2, x is time, we want to find what y equals when x=5, and b is starting speed, which is 0 m/s, since the runner is starting from a rest.
In short, this is:
x=5
y=2x
y=2(5)
y=10
A 1.5 kg rightward moving air glider decreases its speed from 1.872 meters per second to 1.798 meters per second over the length of 1 M long track. Determine the net force acting upon the air glider
Answer:
The magnitude of the net force is 0.204 N.
Explanation:
The net force acting upon the air glider is:
[tex] F = ma [/tex]
Where:
m: is the mass of the air glider = 1.5 kg
a: is the acceleration
First, we need to find the acceleration. Since we have the initial and final speed we can calculate the acceleration as follows:
[tex] v_{f}^{2} = v_{0}^{2} + 2ad [/tex]
Where:
[tex]v_{f}[/tex]: is the final speed = 1.798 m/s
[tex]v_{0}[/tex]: is the initial speed = 1.872 m/s
d: is the distance = 1 m
The acceleration is:
[tex] a = \frac{v_{f}^{2} - v_{0}^{2}}{2d} = \frac{(1.798 m/s)^{2} - (1.872)^{2}}{2d} = -0.136 m/s^{2} [/tex]
The minus sing is because the air glider is desaccelerating.
Now, the magnitude of the net force is:
[tex] |F| = ma = 1.5 kg*0.136 m/s^{2} = 0.204 N [/tex]
Therefore, the magnitude of the net force is 0.204 N.
I hope it helps you!
sound travels slowest through what temperature of water?
a. 20
b. 40
c. 60
d. 80
20 degrees.
Sound travels faster when the medium (something to travel through) is less dense.
For example, Air is less dense than water, water is less dense than a solid.
In this case, since we are working with water, the colder the temperature of water, the denser it is. Likewise, the hotter the temperature of water, it gets less denser.
If this helped, please mark branliest.
The sound travels slowest through 20 degree temperature of water. The correct option is a.
What is sound wave?A sound wave is a result of compression and rarefaction, by which sound is propagated in a material medium such as air.
Sound travels faster when the medium is less dense. In case of air, which is less dense than water.
When the temperature is increased, the object becomes less dense than previous state of the object. The sound wave travels faster in rarer medium than the denser medium.
So, sound travels slowest through 20 degree temperature of water.
Thus, the correct option is a.
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What should be done in order to decrease the gravitational force between two objects?
O Decrease the distance between the two objects.
O Increase the mass of one of the objects.
O Increase the mass of both of the objects.
O Increase the distance between the two objects.
Answer:
Decrease the distance between the two objects
Increase the distance between the two objects to decrease the gravitational force between two objects.
What is force?A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
The gravitational constant, denoted by the capital letter G, is an empirical physical constant involved in the calculation of gravitational effects in Sir Isaac Newton's law of universal gravitation and in Albert Einstein's theory of general relativity.
f = Gmm/r²
Increase the distance between the two objects to decrease the gravitational force between two objects.
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a robotic vacuum is at rest at its charging station. it leaves to clean the house accelerating to 0.3.meters per second in 0.8 seconds. whats is the magnitude of the vacuums acceleration
Answer:
Acceleration, a = 0.375 m/s²
Explanation:
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.
Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.
Mathematically, acceleration is given by the equation;
[tex]Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}[/tex]
[tex]a = \frac{v - u}{t}[/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.Given the following data;
Initial velocity, u = 0m/s
Final velocity, v = 0.3m/s
Time, t = 0.8secs
Substituting into the equation, we have;
[tex]a = \frac{0.3 - 0}{0.8}[/tex]
[tex]a = \frac{0.3}{0.8}[/tex]
Acceleration, a = 0.375 m/s²
Therefore, the the magnitude of the vacuum's acceleration is 0.375 m/s²
What is the mass of a Frisbee that is traveling at 20 m/s and has a kinetic energy of 150 J? Show your work and
use significant figures.
Answer:
Mass, M = 0.75kg
Explanation:
Kinetic energy can be defined as an energy possessed by an object or body due to its motion.
Mathematically, kinetic energy is given by the formula;
[tex] K.E = \frac{1}{2}MV^{2}[/tex]
Where, K.E represents kinetic energy measured in Joules.
M represents mass measured in kilograms.
V represents velocity measured in metres per seconds square.
Given the following data;
Kinetic energy = 150J
Velocity = 20m/s
Making mass the subject formula;
[tex] M = \frac{2K.E}{V^{2}}[/tex]
Substituting into the equation, we have;
[tex] M = \frac{2*150}{20^{2}}[/tex]
[tex] M = \frac{300}{400}[/tex]
Mass, M = 0.75kg
What are transparent strands that are used for communication called?
beams
holograms
lasers
fiber optics
Answer:
fiber optics props
Explanation:
A 20-kg child sits on a horse affixed to a carousel, which is located a distance of 2.3 meters from the
carousel's axis of rotation. The child makes 4 complete trips around the carousel in one minute.
A. What total distance does the child travel?
B. What is the period of the carousel?
C. What is the carousel's frequency?
D. What is the child's tangential velocity?
E. What is the child's centripetal acceleration?
F. What is the net centripetal force on the child?
Answer:
A) D = 57.8
B) 900 sec
C) 1.11 x 10^-3 HZ
D) V= 0.016m/s
E) 1.12x10^-4m/s
F) 2.24 x 10^-3 N