Explanation:
Significant figures of a number written in positional notation are digits that carry meaningful contributions to the measurement resolution of the number.
Answer:
The value of a physical quantity is expressed by a number followed by some suitable unit.
Explanation:
every measurement of a quantity is an attempt to find true value.
rules for identifying significant figures:
1)All non-zero numbers ARE significant. e.g. The number 33.2 has THREE significant figures because all of the digits present are non-zero.
2)Zeros between two non-zero digits ARE significant. e.g. 2051 has FOUR significant figures. The zero is between 2 and 5.
3)Leading zeros are NOT significant. e.g. The number 0.54 has only TWO significant figures. 0.0032 also has TWO significant figures. All of the zeros are leading.
4)Trailing zeros to the right of the decimal ARE significant. e.g. There are FOUR significant figures in 92.00.
5)Trailing zeros in a whole number with the decimal shown ARE significant. e.g. Placing a decimal at the end of a number is usually not done. By convention, however, this decimal indicates a significant zero. For example, "540." indicates that the trailing zero IS significant; there are THREE significant figures in this value.
How do I solve this. I need this done ASAP
Answer:
i really don't know
Explanation:
At what velocity does a 10kg book dropped from 5 meters hit the ground at?
Answer:
10m
Explanation:
v²=u²+2as
=0²+2×10×5
=100
v =10m/s
What are the coefficients need to balance the following equation: H2+O2=H2
Answer:
we can't balance this because there are no atoms of oxygen in the product side
Matt does not want to accompany his friend to the rooftop of a skyscraper because looking down from the rooftop fills him with dread, and leaves him short of breath and
sweaty. Which psychological disorder is Matt likely to be suffering from?
Answer:
anxiety disorder (plato and edmentum)
Explanation:
The energy generated by the sun travels to Earth as electromagnetic waves of varying lengths. Which statement describes an electromagnetic wave with a long wavelength?
А
It has a high frequency and low energy.
B. It has a high frequency and high energy.
C. It has a low frequency and can travel through a vacuum.
It has a low frequency and needs a medium to travel through
Pls help quick!!!!
Answer:
It has low frequency and can travel through a vacuum
Explanation:
C.
Describe the mirror formula for a concave mirror in a shortcut way
Answer:
1/f =1/v+1/u
Explanation:
You toss an apple horizontally at 9.5 m/s from a height of 1.8 m. Simultaneously, you drop a peach from the same height. How long does it take the peach to reach the ground?
Answer:
Peach and Apple will take the same time as the gravitional pull acting on both of them is equal.
height of peach=initial velocity*time+1/2*gravitional pull*(time^2)
1.8=0*time+1/2*9.8*time^2
1.8=0+1/2*9.8*time^2
1.8=1/2*9.8*time^2
3.6/9.8=time^2
taaking value of gravitional pull approx to 10
3.6/10=time^2
0.36=time^2
0.6=time
therefore, the time taken is 0.6sec
Explanation:
The time it takes the peach to reach the ground is 0.61 sec
From the question,
We are to determine how long it would take the peach to reach the ground.
From one of the equations of kinematics for free falling objects,
We have that
[tex]H = ut + \frac{1}{2}gt^{2}[/tex]
Where
H is the height
u is the initial velocity,
t is the time
and g is the acceleration due to gravity ( g = 9.8 m/s²)
Since the object is dropped with no velocity, then the initial velocity is 0 m/s
From the given information
H = 1.8 m
u = 0 m/s
Putting the parameters into the formula,
We get
[tex]1.8 = 0(t) + \frac{1}{2}(9.8)t^{2}[/tex]
This becomes
[tex]1.8 = 0 + 4.9t^{2}[/tex]
[tex]1.8 = 4.9t^{2}[/tex]
Then,
[tex]t^{2} = \frac{1.8}{4.9}[/tex]
[tex]t^{2} = 0.367347[/tex]
∴ [tex]t =\sqrt{0.367347}[/tex]
t = 0.60609 sec
t ≅ 0.61 sec
Hence, the time it takes the peach to reach the ground is 0.61 sec
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Determine the stopping location of the prize wheel. At this moment it is centered on the number 11. It is spinning at a rate of 124.40 rpm. It is slowing at a rate of 1.400 rad/s/s.
Predict the time the wheel will remain spinning, the angular displacement it will go through, and then use this to predict the number on which the wheel will stop. To be safe, you will also get one number the right and to the left of the number you chose.
Answer:
The wheel spins for 11.43s. The number cannot be determined.
Explanation:
We know that initial velocity is 124.4 rpm = 13.027137522 rad/s, acceleration is -1.14 rad/s^2, and final velocity is assumed to be 0 rad/s. We are asked to find t and displacement. We use the equation [tex]\omega=\omega_0+\alpha t[/tex] where [tex]\omega=0 rad/s[/tex], [tex]\omega_0=13.027 rad/s[/tex], [tex]\alpha=-1.14rad/s^2[/tex], and [tex]t=?[/tex].
Rearrange the equation to obtain [tex]\frac{\omega-\omega_0}{\alpha}=t[/tex]. Plug in the numbers and solve to obtain [tex]t=11.43s[/tex].
The number of the wheel cannot be determined as we do not know the placement of numbers on the wheel.
what device creates a magnetic field from an electric current ?
Answer:
An electromagnet is the device through which runs current and it creates a magnetic field.
If 20,000J of work is used to move a car that is broken down, how much is the change in energy that has occurred?
Answer:
K_f = 20000 J
Explanation:
This is a conceptual exercise, where the relationship between work and kinetic energy should be used
W = ΔK
W = K_f - K₀
In this case, as the car is damaged, its initial velocity is zero and therefore its initial kinetic energy is also zero.
W = K_f
consequently the work is completely transformed into kinetic energy of the car
K_f = 20000 J
Please I need an answer
Answer:
D
Explanation:
The ballon will repel
6. Do you think that aliens exist?
what is the shape of a solid?
Answer:
3d shape is the shape of solid
What happens to molecules when their kinetic energy decreases? * 6 points They move slower they move faster they get heavier It depends on the type of molecule
When ANYTHING moves slower, its kinetic energy decreases.
Two students move a box to the left. One student pushes with a force of 100 N to the left, and the other student pulls with a force of 85 N to the left. They move the box 20 m in 7 s. What is the total amount of work done on the box by the students?
Answer:
Resultant Force= F1 - F2
F1= 100N
F2= 85N
Resultant Force= 100N - 85N
R.F = 15N
Workdone= Force x Displacement
Force = 15N
Displacement = 20m
= 15N X 20m
=300Nm or Joules
10 poin
What is the momentum of a 25kg cart traveling left with a velocity of 10
m/s?
is it easier to use a shorter or long stapler
Answer:
long stapler
Explanation:
Scientists use a substance called Iodine-131 to treat cancer. As Iodine-131 undergoes radioactive decay and emits beta particles, it kill cancer cells.
Which fundamental force is being used in this type of treatment?
strong
weak
gravitational
electromagnetic
Answer:
I think it's strong I'm not to sure I'm sorry if it's wrong
Answer:
hello there people of the internet it may be b cause u guys said it wrong for a
Explanation: AND The guy say it to so i made it easyer to see
2. An object's weight is proportional to its _ or _ from another object
Answer:
mass
gravitational pull
Help me please ()- :))
Answer:
A pardon
Explanation:
Hope this helps
Answer:
that would probably be a A.Pardon
19. A car accelerates uniformly in a straight line from 10 m/s to 20 m/s in 5 seconds. What is the
acceleration?
Answer:
2 [tex]m/s^{2}[/tex]
Explanation:
Acceleration = [tex]\frac{Final velocity-Initial velocity}{Time}[/tex]
= [tex]\frac{20 - 10}{5}[/tex]
= [tex]\frac{10}{5}[/tex]
= 2 [tex]m/s^{2}[/tex]
What causes water molecules to be attracted to each other?
Answer:
the positive and negative charges of the hydrogen and oxygen atoms that make up water molecules makes them attracted to each other
Explanation:
Hope this helps dude
Please help mee
1. A body weighing 2 kg moves in a straight line with a speed of 72 km / h. If the force 10N will act on the body, after how long will its speed become 30m / s?
Answer:
It's an uniformly accelerated motionVf=at +v0v0=72 km/h:3.6=20 m/s
a=F/m=10/2=5m/s^2
t=(vf-v0)/a
t= (30-20)/5=10/5=2s
How far will a person go if they jog for 2 hours at a speed of 12 km/hr?
Answer:
24
Explanation:
24
QUICK: A circular loop of radius r is rotated through a magnetic field B, which of the following would increase the magnetic flux through the loop by a factor of 16?
SELECT ALL THAT APPLY
A. Doubling B and quadrupling r.
B. Quadrupling B and doubling r.
C. B remains constant and quadrupling r.
D. Doubling B and doubling r.
A car accelerates from 0 to 72 km/hr in 8 seconds. What is the car's acceleration?
Explanation:
Vi = 0 m/s
Vf = 72 km/hr = (72×5)/18 = 20 m/s
t = 8 s
Vf = Vi + a×t
20 = 8a
a = 2.5 m/s^2
Answer:
Initial Velocity (u) = o m/s
Final Velocity (V) =(72*1000)/1*60*60 m/s
= 20m/s
time (t) =8 sec
Acceleration(a)= v-u /t
=(20-0)/8
=2.5 m/s^2
this is the answer i just did the problem
at what distance from a 2.45*10^-6 C charge will the electric field be 100 N/C?
Answer:14.8
Explanation:
Trust me
The distance will be = 14.85 m
What is electric field ?A region around a charged particle or object within which a force would be exerted on other charged particles or objects.
given :
Charge (q)= 2.45*[tex]10^{-6}[/tex] C
Electric field (EF) = 100 N/C
to find = ? distance (r)
Electric field = 1/4π∈o * (q/[tex]r^{2}[/tex])
100 = 9 * [tex]10^{9}[/tex] * ( 2.45*[tex]10^{-6}[/tex] / [tex]r^{2}[/tex])
[tex]r^{2}[/tex] = 220.5
r= [tex]\sqrt{220.5}[/tex]
r = 14.85 m
The distance will be = 14.85 m
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2. A rock is dropped from rest at the top of a 10 meter tall building. How much time does the rock
take to hit the ground?
Answer:
1.4 seconds
Explanation:
here u= 0
v= ?
h= 10m
g= 9.8 m/ s*2
using 2as = v^2 - u ^2
2x9.8x10 = v^2 - 0
v^2 = 196
v = 14 m
time = v- u/ a
14 / 98
1.4 seconds
Gloria wants to test if the amount of air pressure in a soccer ball affects how far the ball will roll. She purchases five soccer balls that are all the same size and a ball pump with a pressure gauge attached
She constructs a device to hit the ball and chooses a smooth, flat surface for the ball to roll on. She has a log ready to record her data. What should Gloria do before beginning her experiment?
A
inflate each ball the same amount
B
inflate each ball a different amount
C
construct different devices to hit the ball
D
choose different surfaces to roll the ball on
Which statements describe the principles of the big bang theory? Select two options. The universe is continuing to expand. The universe stretched from a single point. The universe resulted from the collision of light and dark energy. The universe expanded, but its size is now remaining constant. The universe is slowly collapsing and getting smaller.
The statements which describe the principles of the big bang theory include:
The universe is continuing to expandThe universe stretched from a single point.Big bang theory was postulated by Georges Lemaître and he is regarded as
the father of this principle. This principle talks about how the universe was
formed.
He proposed that the universe was formed from a single point which then
began expanding and stretching to accommodate more components.
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Answer:
A and B
Explanation:
edge 2023