Answer:
Change in velocity
−2−10=−12
Time required is 4 seconds
a=Δv/t
=−12/4
=−3m/s²
Hence,
option C is correct answer.
Which can make 4 covalent bonds? Carbon, Silicon, or both?
Answer:
I would say both
Explanation:
Each silicon atom has four valence electrons which are shared, forming covalent bonds with the four surrounding Si atoms.
Carbon contains four electrons in its outer shell. Therefore, it can form four covalent bonds with other atoms or molecules. The simplest organic carbon molecule is methane (CH4), in which four hydrogen atoms bind to a carbon atom (Figure 1).
What's a real-life example of Newton's Second Law?
What do the arrows in this photograph represent?
A. Gravity and air resistance
B. An action-reaction force pair
C. A pair of unbalanced forces at work
D. Friction and air resistance
Answer: B An action-reaction force pair
Explanation: Took the exam
The arrows in this photograph represent: An action-reaction force pair. Hence, option (B) is correct.
What is action-reaction force pair?When two bodies interact, they exert an equal and opposite force on one another in accordance with Newton's third law of motion. Action-reaction forces are made up of these forces.
"When one body exerts a force on the other body, the first body experiences a force that is equal in magnitude in the opposite direction of the force which is exerted," according to Newton's third law of motion.
According to the above assertion, there are always two forces operating on the objects involved in an interaction. The forces are of identical magnitude, but the direction of the force acting on the first object is different from the direction acting on the second.
Learn more about force here:
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Elements with positive valences usually ______ electrons
A. Donate
B. Accept
C. Have no
D. Create
From an apple tree 2 metres high, a 100g mass apple fell of the tree, what work did it do?
Answer:
Workdone = 1.96 Nm
Explanation:
Given the following data;
Mass = 100g to kg 100/1000 = 0.1Kg
Distance = 2m
To find the workdone;
First of all, we would determine the force acting on the apple
Force = mass * acceleration due to gravity
But, acceleration due to gravity is equal to 9.8m/s²
Force = 0.1 * 9.8
Force = 0.98N
Now, we can find the workdone using the formula;
Workdone = force* distance
Substituting into the equation, we have
Workdone = 0.98 * 2
Workdone = 1.96 Nm
What color rays have the smaller/lesser angle
Answer:
Blue?
Explanation:
Which is the correct definition for sea floor spreading
What type of Circuit do they use in a home? WHY ? (Simple circuit / Parallel circuit / Series circuit)
Answer:
Parallel Circuits
Explanation:
Loads can be operated on their own. If you had a series circuit, adding another light would dim the rest!
Which of the following instruments measures time most accurately?
a. Sundial
b. quartz watch
c. pendulum clock
d. watch with balance wheel
Answer:
b) Quartz Clock
Explanation:
It's is a very type of clock which uses the vibration of quartz crystals to measure time accurately
What is the object’s average acceleration between 0.0 s and 5.0 s?
ANSWER FAST! PLEASEE
Answer:
[tex]2.5[/tex]
Explanation:
[tex]0.0+5.0=5.0[/tex]
[tex]\frac{5}{2} =2.5[/tex]
hope this helps!!!!!!!!!!
32. Increasing the amplitude of a sound wave produces a
sound with
1. lower speed
2. higher pitch
3: shorter wavelength
4. greater loudness
Answer:
4
Explanation:
because amplitude of a sound wave is related to loudness of the sound, so the higher the amplitude, the louder the sound
hope this helps
Why does the moon appear to change its shape as seen from Earth
A.Different parts of the sunlit moon become visible as the moon revolves around the Earth
B.Different parts of the moon are lit as the moon rotates
C.The moon moves farther and then closer to Earth
D.The sun lights different parts of the moon during different seasons
Answer:
Explanation:
Why does the moon appear to change its shape as seen from Earth
What happens when a pebble lying on the ground is kicked?
A. Energy is completely lost.
B. Energy is created.
C. Energy is destroyed.
D. Energy is transferred.
Answer:
I'm 100% sure it's D. but if it isn't, sorry :(
100%
Sutt S
Kam Scheela MARIO MARTINEZ-HTPhysics.pdf
Test BGK
HW#10
Question: A pinball machine's plunger has a spring constant of 22
N/m and is compressed by 0.04 m to start a 0.006 kg pinball.
1. What is the elastic potential energy before the ball is released?
2. What is the kinetic energy of the pinball the instant it leaves the
spring?
3. What is the speed of the pinball the instant it leaves the spring?
4. If the pinball is moving at 1.3 m/s as it is deflected horizontally
across the top of the pinball machine, how much higher above the
ground is this part of its path when compared to its starting
position?
Squation
Drawing
Ta
Signature
Instructions.
Answer:
1. The elastic potential energy is 0.0176 Joules
2. The kinetic energy of the pinball the instant it leaves the spring is 0.0176 Joules
3. The speed of the pinball the instant it leaves the spring is approximately 2.42212 m/s
4. The height of the part where the pinball is located on the machine above the ground is approximately 0.213 meters
Explanation:
The spring constant of the pinball machine's plunger, k = 22 N/m
The amount by which the pinball machine's plunger is compressed, x = 0.04 m
The mass of the pinball ball, m = 0.006 kg
1. The elastic potential energy, P.E. = 1/2·k·x²
By substitution, we get;
P.E. = 1/2 × 22 N/m × (0.04 m)² = 0.0176 J
The elastic potential energy, P.E. = 0.0176 J
2. At the instant the pinball leaves the spring, the plunger and therefore the force of the plunger no longer acts on the pinball
Since there are no external forces acting on the pinball to increase the speed of the pinball after it leaves the spring, the velocity reached is its maximum velocity, and therefore, the kinetic energy, K.E. is the maximum kinetic energy which by the conservation of energy, is equal to the initial potential energy
Therefore;
K.E. = P.E. = 0.0176 J
The kinetic energy of the pinball the instant it leaves the spring, K.E.= 0.0176 J
3. The kinetic energy, K.E., is given by the following formula;
K.E. = 1/2·m·v²
Where;
v = The speed or velocity of the object having kinetic energy K.E.
Therefore, from K.E. = 0.0176 J, and by plugging in the values of the variables, we have;
K.E. = 0.0176 J = 1/2 × 0.006 kg × v²
v² = 0.0176 J/(1/2 × 0.006 kg) = 88/15 m²/s²
v = √(88/15 m²/s²) ≈ (2·√330)/15 m/s ≈ 2.42212 m/s
The speed of the pinball the instant it leaves the spring, v ≈ 2.42212 m/s
4. The height of the pinball is given by the following kinematic equation of motion;
[tex]v_h[/tex]² = u² - 2·g·h
Where;
[tex]v_h[/tex] = The velocity of the pinball at the given height = 1.3 m/s
u = v ≈ 2.42212 m/s (The initial velocity of the pinball as it the spring)
g = The acceleration due to gravity ≈ 9.8 m/s²
h = The height of the pinball above the ground
We get;
[tex]v_h[/tex]² = 1.3² = 2.42212² - 2 × 9.8 × h
∴ h = (2.42212² - 1.3²)/(2 × 9.8) ≈ 0.213
The height of the part where the pinball is located on the machine above the ground, h ≈ 0.213 m
which material would you select to replace broken handle of electric kettle
please will mark as brainlist
Answer:
hot glue
Explanation:
-insert the hot melt cylinder into the gun and wait until it heats up;
-gently apply a layer of substance to the crack;
-spread the hot glue in a thin layer over the surface;
-wait until it freezes.
I got stuck on this question
Answer it 2n
Explanation:
I NEED HELP
The average kinetic energy of the particles of two pieces of iron at the same temperature and mass would be __________.
Question 1 options:
Different
The same
Not equivilent
With in 500 degrees of eachother
Answer:
the answer is different
Explanation:
i took the test
The graph shows the amplitude of a passing wave over time in seconds (s) What is the approximate frequency of the wave shown? A. 6 Hz B. 0.2 0.4 Hz
Answer:
0.2 I took the test
Explanation:
I took the test
The time period of the whole wave cycle is 6 seconds but the time period of one complete wave is about 4 seconds here. The inverse of this time period is the frequency, that is 0.2 Hz.
What is frequency ?Frequency by definition is the number of events per unit time. Frequency of a wave is the number of wave cycles in one second. It is the inverse of the time period.
Frequency is directly related to the energy of the wave. As the frequency increases, energy of the wave also increases. In the given graph the wave cycle is given for a time of 6 seconds.
The time period for one complete wave is 4 second from the graph.
thus, T = 4 s
v = 1/T
= 1/4 = 0.2 s⁻¹ or 0.2 Hz
Therefore, the frequency of the wave shown, is 0.2 Hz.
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As a cold air mass advances on a warm air mass, what usually comes before it?
Answer: A cold front occurs when a cold air mass advances into a region occupied by a warm air mass. If the boundary between the cold and warm air masses doesn't move, it is called a stationary front.
Explanation: Two types of occluded front exist: the warm-type and the cold-type. They’re distinguished by the relative temperatures of the air mass ahead of the occlusion – in other words, the air mass ahead of the original warm front – and the air mass behind the cold front. If the air behind the cold front is colder than the air ahead of the occlusion, it shoves beneath that air (because it’s denser) to form a cold-type occluded front. If the air behind the cold front is warmer than the air ahead, it rides over it to form a warm-type occluded front – which appears to be the more common case. In either situation, the lighter warm air representing the air mass originally between the warm and cold fronts sits above the boundary between the two cooler air masses.
Hope this helps!!
Help Easy Question and Brainly. What's the answer?????
Answer:
negatively
Explanation:
Answer:
Negatively charged
Explanation:
PLS ANSWER MY QUESTION TOO
True or false? If two components are connected in series, the current through one component will
always be the same as the current through the other.
the answer is ( True ) .
the current is the same in series circuits .
someone help please !!
Answer:
c.
is the answer please brainliest
Two rocks of masses 5 kg and 10 kg a dropped from rest from a height of 20 m above ground. Ignore all friction and air resistance. Just before
they hit the ground, which statement is true about the rocks?
(A) The value for the acceleration of the 5 kg rock is the same as the value for the 10 kg rock, but their velocity values are different.
(B) The values for the acceleration and velocity of the 5 kg rock are greater than the values for the 10 kg rock.
(C) The values for the acceleration and velocity of the 5 kg rock are less than the values for the 10 kg rock.
(D) The values for the acceleration and velocity of the 5 kg rock are the same as the values for the 10 kg rock.
Answer:
D
Explanation:
F=ma
F of 5 kg rock = 49N
F of 10 kg rock = 98 N
Divide by respective masses to get acceleration, and of course you will get 9.8 m/s^2 for both.
Now, use potential energy equals kinetic energy. mgh=(1/2)mv^2 mass cancels out of the equation, since it's on both sides, so we can stop right there. We have algebraically determined that mass does not affect acceleration or velocity!
Hope this helped.
which of the following is an example of potential energy:
(choose 2)
- a fire
- a book standing still on a shelf in the library
- a printer that is not connected
- your cellphone, when you make a call to someone
Answer:
fire is a potential energy
What is the acceleration of the object from 2s to 14s
pls help, i really dw fail :(
Answer:
Using the Newton equation
V²=U² +2as
Given; V=9.2m/s U = 0m/s( because it starts from rest)
S=26.2m.
9.2²=0²+2(26.2)a
a =9.2²/2(26.2)
a=84.6/52.4
a=1.60m/s²
Answer:
2.A
3.D
Explanation:
HOPE THIS HELPS!! :)
15. How mh energy does a 850W microwave transfer reheating a meal for 30s?
Answer: 25500 joules
Explanation: E = P x t
A force of 1200N is creating a pressure of 60Pa on a surface. Calculate the area of the surface.
Answer: 20 squared units
Explanation:
Area = Force / Pressure
In what do electromagnetic waves cause disturbances when they transfer
energy?
A. Electric fields only
O B. Both electric and magnetic fields
C. Neither electric nor magnetic fields
O D. Magnetic fields only
HELP PLZ
What would it mean if an object had no potential energy?