Answer:
B. When an energy transformation happens, no energy is destroyed
or created.
Explanation:
Acellus
A car accelerates for 12.0
seconds at a rate of 1.20 m/s2. If
the final velocity is 30.0 m/s, what
was its starting velocity?
Answer:
Vi=15.6m/s
Explanation:
a=(Vf-Vi)/t
when we find Vi from the above formula
Vi = Vf - at
Vi=30m/s - 12sec×1.2m/s^2
Vi = 15.6m/s
A 0.15-kg object is projected vertically into the air with a
velocity of 30. m/s. How high above the ground is the
object after 3.3 seconds?
A 46 m
B 53 m
C 110 m
D 150 m
Answer:
A
Explanation:
y = 30(3.3) - .5(9.8)(3.3^2)
What is the average velocity of a car that drives 50 meters to the left in 5 seconds?
Answer:
[tex]\boxed {\boxed {\sf 10 \ m/s \ left}}[/tex]
Explanation:
Velocity is the speed of something in a given direction. It is a vector quantity, so it has both magnitude and direction. Velocity is calculated by dividing the displacement by the time.
[tex]v= \frac{d}{t}[/tex]
The car drives 50 meters to the left in 5 seconds.
d= 50 m left t= 5 sSubstitute the values into the formula.
[tex]v= \frac{50 \ m \ left}{5 \ s}[/tex]
Divide.
[tex]v= 10 \ m/s \ left[/tex]
The average velocity of the car is 10 meters per second to the left.
Marsha's car accelerates at an average rate of 3 m/s2. How long does it take for her car to speed up from 10 m/s to 15 m/s?
Explanation:
We are going to use the following equation:
[tex]v = v_0 + at \Rightarrow t = \dfrac{v - v_0}{a}[/tex]
[tex]t = \dfrac{15\:\text{m/s} - 10\:\text{m/s}}{3\:\text{m/s}^2}[/tex]
[tex]\:\:\:\:=1.67\:\text{s}[/tex]
Do you think it wise to make a decision under the influence of an emotion?
Answer:
no because It can be a disadvantage for us
Answer:
no
Explanation:
nop it isn't wise to make a decision under the influence of emotion because if you act and make decision From influence of emotion you will gonna regret so think before you make decision
Together a car and its driver have a mass of 1234 kg. The car is slowed with an acceleration of -4.5 m/s2. What is the net force on the car?
Answer:
-5553N
Explanation:
Fnet = ma
Fnet = 1234kg * -4.5m/s^2
Fnet = -5553N
Which of the following choices is the most important to do before starting an exercise program?
A. see your doctor
B. talk to your friends for advice
C. lift some weights
D. measure your body fat
Please select the best answer from the choices provided.
O O O O
Một quả cầu khối lượng m được nối giữa hai đầu đoạn dây AB và CD như hình vẽ. Biết r
ằng, độ bền của hai đoạn dây AB và CD là như nhau. Nếu kéo đầu D của sợi dây bởi lực kéo có độ lớn tăng dần một cách từ từ thì
A. dây sẽ bị đứt đồng thời tại hai đoạn AB và CD.
B. đầu tiên dây sẽ bị đứt tại CD, sau đó đứt tại AB.
C. dây sẽ bị đứt tại phần CD.
D. dây sẽ bị đứt tại phần AB.
Answer:
B
Explanation:
B
what would you want individuals and communities to understand to help them avoid negatively affecting climate
Answer:
ur
Explanation:
mom
3. a) If the distance between two objects increases by a factor of 5 (5),
does the gravitational force between the objects increase or decrease?
By what factor does the gravitational force between the objects
change?
b) If the mass of one object decreases by a factor of 3 (*1/3), does the
gravitational force between them increase or decrease? By what factor
does the gravitational force between the objects change?
Answer:
Answer for A
Explanation:
F1=GmM/r1^2
If r2 becomes r2=5r
F2=GmM/(25r^2)
Multiply with 25 gives to maintain the same force
I.e.,25F2=F1
F2=G(25m)M/25r^2=F1
By the factor 25 would change to increase to same.
Calculations, show formula, substitution, and answer with units for full credit:
1. A train travels 150 kilometers in 5 hours. How fast is it traveling?
Answer:
30 km/h
Explanation:
V=S:t
speed=length:time
150:5=30
An election accelerated through 1 kV possesses de - Broglie wavelength 1. What will be the wavelength of
the same electron, when accelerated through 16kV:
1) 161
2) 41
3) 1/4
4) 116
Answer:
Correct option is
B
1.7
A
˚
λ=
p
h
=
2mE
h
=
2mqV
h
λ=
2×9.1×10
−31
×1.6×10
−19
×50
6.6×10
−34
=1.72×10
−10
=1.72A
Option B
16. If "team A has 3 of its bocce balls closer to the pallino than any of their opponent's balls, who wins the
frame
How many points do they get for that frame?
How many do their opponents get for that frame?
Answer:
Team A wins the frame with three points. The opposing team gets zero points for the frame.
Explanation:
Government has banned the use of plastic bags in some states. Why?
Answer:
people throw plastic into the oceon
Explanation:
.when people throw plastic into the ocean mother nature gets hurt because of waste if it continues the see we see today will be dirty if all of humanity throwed all of the plastic and waste in the ocean
Random sampling is used by researchers to obtain an).
control group
population of interest
representative sample
experimental sample
Plz help
Answer:
hey there
the correct answer is option ( B ) population of interest
Explanation
A random sample is a subset of individuals randomly selected by researchers to represent an entire group as a whole. The goal is to get a sample of people that is representative of the larger population.
Explanation:
Hope it helps
Have a nice day : )
Which of the following CANNOT be
picked with magnet?
A Safety pins
B
Coins
C Cork
D Needle
E Chain
Answer:
Well, there is a kind of magnet to pick up a coin.. I think you can pick up a needle with one too.. I think safety pins. depending on what its made of though.
Explanation:
Answer:
cork cannot be picked with a magnet
Explanation:
i hope that helps
In which scenario does Einstein's theory apply, but not Newton's?
comparing the gravitational forces between two systems
measuring how much energy light loses while it travels
calculating the speed of a satellite orbiting Earth
landing a spaceship on the moon
Answer:
B. Measuring how much energy light loses while it travels.
Explanation:
Got it right on edge.
Answer:
B
Explanation:
measuring how much energy light loses while it travels
A simple pendulum is made of a small blob of mass m=7.000 kg attached to the end of an inextensible wire. The angular amplitude of oscillation is θ=5.730°. Consider that the gravitational acceleration is g=9.807 m/[tex]s^{2}[/tex]. What is the magnitude of the tension in the wire when the blob is directly below its point of support?
Answer:
The tension must be equal to the weight of the bob plus the centripetal force that is provided at eth end of the motion.
h = L (1 - cos theta) where h is the height to which the bob is raised
cos 5.730 = .995
h = .005 L
Also 1/2 m v^2 = m g h speed of the bob at the bottom
v^2 = 2 g h = .01 g L where 2 h = .01 L
v^2 / L = .01 g
m v^2 / L = .010 g m = .07 g since m = 7
Total tension = m g (1 + .07) = 1.07 m g
T = 9.807 * 1.07 * 7 = 73.45 kg m / s^2
What is the mathematical relationship between these three values? 0.78 seconds, -9.81 m/s^2, and -7.68 m/s. I need help with this, please.
The mathematical relationship between time, acceleration and velocity is given by: [tex]Acceleration = \frac{v\;-\;u}{t}[/tex]
In Physics, the acceleration of an object or body can be defined as the rate of change of velocity with respect to time.
Hence, acceleration is calculated by subtracting initial velocity from the final velocity and dividing by the time.
Mathematically, acceleration is given by the formula;
[tex]Acceleration = \frac{v\;-\;u}{t}[/tex]
Where:
v is the final velocity measured in meter per seconds (m/s).u is the initial velocity measured in meter per seconds (m/s).t is the time measured in seconds.Also, the acceleration of an object or body is measured in meter per seconds squared ([tex]m/s^2[/tex]).
Read more: https://brainly.com/question/8898885
Question 5 (10 points)
When a large amount of groundwater is extracted, what type of effects can occur
due to this large amount of water extraction? (*select all that apply)
Select 3 correct answer(s)
water table decrease
no change to water table
salt water intrusion
sinkholes
PLEASE HELP
Answer:
sink hole, water table decrease ,and salt water intrusion
Answer:
pls give brainliest
Explanation:
sink hole,water table descrese and salt water intrusion
what is the negative of a vector
Answer:
A negative of a vector represents the direction opposite to the reference direction
Explanation:
It means that the magnitude of two vectors or same but they are opposite in direction . For example if A and B are two vectors that have equal magnitude but opposite in direction , then vector A is negative of vector B.
Which photon has more energy?
A. All photons have the same energy.
B. A photon of an infrared light
C. A photon of red light
D. A photon of micro wave.
How do we measure the amplitude of a wave? (Plzz help my sister, 17 points!!!!)
1.crest to trough
2.crest to crest
3.trough to trough
4.crest to rest position
Answer:
U calculate from CREST to REST POSITION
If a car is traveling at 10m/s and then accelerates for 10s at a rate of 0.5m/s^2,what will be final velocity?
Answer:
[tex]u= 10 \frac{m}{s} \\ t = 10 \: s \\ a = .5 \frac{m}{ {s}^{2} } \\ v = x \\ v = u + at \\ x = 10 + .5 \times 10 \\ x = 10 + 5 \\ x = 15 \frac{m}{s} \\ thank \: you[/tex]
Answer:
15m/s
Explanation:
a=(Vf-Vi)/t
0.5m/s^2=(Vf-10m/s)/10s
when we solve this Vf=15m/s^2
a 1500 kg car accelerates at a rate of 40m/s what is the amount of force
Hi there!
Use the following equation: (Newton's Second Law)
∑F = ma, where:
∑F = net force (J)
m = mass (kg)
a = acceleration (m/s²)
Plug in the given values:
∑F = 1500 · 40 = 60,000 J
A pyramid was built with approximately 2.3 million stone blocks, each weighing 2.4 tons (1 ton = 2,000 lbm). Find the mass of the pyramid in kg.
Total weight in tons
[tex]\\ \sf\longmapsto 2.3\times 10^6\times 2.4[/tex]
[tex]\\ \sf\longmapsto 5.52\times 10^6[/tex]
[tex]\\ \sf\longmapsto 5520000ton[/tex]
1ton=1000kg[tex]\\ \sf\longmapsto 5520000\times 1000[/tex]
[tex]\\ \sf\longmapsto 5520000000kg[/tex]
[tex]\\ \sf\longmapsto 5.52\times 10^9Kg[/tex]
why a switch is connected in phase wire and never is neutral wire?
Answer:
ifyou have a wre connect you should not have to connected
i think that is the answer
Which term best describes a question that can be tested?
A. Phenomenon
B. Hypothesis
C. Experiment
D. Observation
Answer:
Hypothesis
Explanation:
because in science a hypothesis is a guess/question that you test. it can be changed many times
Answer:
C) experiment. Is the answer.
hypothesis is the educated guess about what the result of the experiment is before conducting the experiment.
Observation is what you see and record during the experiment.
Which of these examples best illustrates Newton’s second law of motion
A a 100 lb boy has twice as much inertia as a 200 lb on boy.
B a truck need a more powerful engine then a small car.
C A hockey puck slides easily across the ice.
D A satellite stays in orbit for a long time.
Answer:
C )A hockey puck slides easily across the ice.
If you ran at a rate of 300 m/min for 30 minutes, how far would you have run?
Answer:
9000 m
Explanation:
I multiplied 300 by 30!
Hope this helps :)
Pls make brainliest :3
And have an amazing day <3