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【Contact forces involve push, pull and friction. A contact force is when two interacting objects are touching, for example: when you throw a ball you are using a contact force.】
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Choose Yes or No to tell if the number 9.81 will make each equation true.
12.47 – □ = 2.66
8.05 + □ = 17.96
14.08 – □ = 4.17
3.67 + □ = 13.48
Answer:
yes
no
no
yes
Explanation:
Ice melts in your
glass of water. What method of heat transfer causes this?
An 8000.0 kg truck starts off from rest and reaches a velocity of 18.0 m/s in 6.00 seconds. What is the truck’s acceleration and how much momentum does it have after it has reached this final velocity?
Explanation:
Acceleration is change in velocity over time.
a = Δv / Δt
a = (18.0 m/s − 0 m/s) / (6.00 s)
a = 3.00 m/s²
Momentum is mass time velocity.
p = mv
p = (8000 kg) (18.0 m/s)
p = 144,000 kg m/s
When an 8000.0 kg truck starts off from rest and reaches a velocity of 18.0 m/s in 6.00 seconds then the truck’s acceleration would be 3 m/s² and the momentum after it has reached this final velocity would be 144000 kgm/s.
What is momentum?It can be defined as the product of the mass and the speed of the particle, it represents the combined effect of mass and the speed of any particle, and the momentum of any particle is expressed in Kg m/s unit.
Mathematically the formula of the momentum is
P = mv
where P is the momentum of the particle
m is the mass of the particle
v is the velocity by which the particle is moving
As given in the problem An 8000.0 kg truck starts off from rest and reaches a velocity of 18.0 m/s in 6.00 seconds
By using the first equation is given as follows
v = u + at
18 =0 + a×6
a = 3 m/s²
As given in the problem the final velocity of An 8000.0 kg truck is 18 m/s
the momentum is given by the formula
P = mv
P= 8000×18
P = 144000 kgm/s
Thus, the truck’s acceleration would be 3 m/s², and the momentum after it has reached this final velocity would be 144000 kgm/s.
Learn more about momentum from here
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1. A buoyant force of 790 N lifts a 214 kg sinking boat.What is the boat's
net acceleration?
The driver of a car slams on the brakes, causing the car to slow down at a rate of
20.0ft/s as the car skids 295ft to a stop.
How long does the car take to stop?
What was the car’s initial speed?
Answer:
The time taken for the car to stop is 5.43 s.
The initial velocity of the car is 108.6 ft/s
Explanation:
The following data were obtained from the question:
Acceleration (a) = –20 ft/s² (since the car is coming to rest)
Distance travalled (s) = 295 ft
Final velocity (v) = 0 ft/s
Time taken (t) =?
Initial velocity (u) =?
Next, we shall determine the initial velocity of the car as shown below:
v² = u² + 2as
0² = u² + (2 × –20 × 295)
0 = u² + (–11800)
0 = u² – 11800
Collect like terms
0 + 11800 = u²
11800 = u²
Take the square root of both side
u = √11800
u = 108.6 ft/s
Therefore, the initial velocity of the car is 108.6 ft/s.
Finally, we shall determine the time taken for the car to stop as shown below:
Acceleration (a) = –20 ft/s² (since the car is coming to rest)
Final velocity (v) = 0 ft/s
Initial velocity (u) = 108.6 ft/s
Time taken (t) =?
v = u + at
0 = 108.6 + (–20 × t)
0 = 108.6 + (–20t)
0 = 108.6 – 20t
Collect like terms
0 – 108.6 = – 20t
– 108.6 = – 20t
Divide both side by –20
t = – 108.6 / –20
t = 5.43 s
Therefore, the time taken for the car to stop is 5.43 s.
Eric traveled east for 150 miles in 2 hours. Then he went west for 40 miles in 1 hour. What is the average velocity?
Answer:
190 is the average velocity.
Explanation:
Just add them together
Shira listed the steps for protein production in cells. 1. A strand of RNA is made. 2. RNA leaves the nucleus. 3. RNA moves to the ribosome. 4. A protein is made. Which step is missing? DNA unzips after step 1. DNA unzips before step 1. DNA is replicated after step 3. DNA is replicated before step 3.
Answer: DNA unzips before step 1
Explanation:
RNA is gotten from DNA.
Answer: (B)
Explanation:
im as shure this answer is right as the world is round and slightly slanted
Scientific knowledge builds upon previous knowledge."
Which situation does NOT illustrate this statement?
A) Theodor Schwann using his knowledge about plant cells and experimenting to see if the same was true about animal cells.
B) Becquerel's accidental discovery of radiation when photographic plates were inadvertently left near a radioactive rock.
C) Robert Hooke using the Galileo's microscope to help create a compound microscope which is stronger and better that Galileo's.
D) Matthias Schleiden taking the knowledge gained by Robert Brown about the nucleus of the cell to develop a new thought about the role of the nucleus in cell development.
Answer:
c
Explanation:
pls awnser short i need awnsers
Answer:
4. 0.12mm
5:
a. screw gauge
b. caliper
Answer:
0.11 mm
vernier calipers
im not sure about the sure about B
Explanation:
The periodic table was created by grouping elements according to their properties. An unknown substance was shown to contain a metal element with an atomic mass around 28. With which of the following elements is it most likely grouped?
A. nitrogen
B. carbon
C. boron
D. oxygen
A rock is thrown downward from the top of a cliff with an initial speed of -13m/s.If the rock hits the ground after 2.7 s, what is the height of the cliff
Answer:
0.62 m down.
Explanation:
Use the formula d= vi*t +1/2 at^2
So the initial speed or vi is -13 m/s and time is 2.7 s and a or acceleration is 9.8 m/s^2 down ( because it's the gravity). So you plugged all the values and you will get 0.62 m. We put the down because the acceleration is saying down. Because displacement is vector quantity you have to show the direction of it.
Which of the following statements are true
Answer:
none of them
Explanation:
Answer:
Did u forget to add a pic?
Explanation:
please help me in this
Answer:
its d
Explanation:
Parents play a key role in educational success.true or false
An object with a negative velocity could have a positive acceleration.
Answer:
True
Explanation:
An object which moves in the negative direction has a negative velocity. If the object is slowing down then its acceleration vector is directed in the opposite direction as its motion (in this case, a positive acceleration).
PLS ANSWER ASAP
A golf ball travels upwards and rightward through the air. Of the forces listed, identify which act upon the golf ball.
a) normal force
b) tension
c) gravity
d) applied
e) air resistance
f) friction
Answer:
Gravity, normal force, friction, and air resistance.
Explanation:
Assuming the ball is on earth, there is always gravity acted upon the object.
Since the problem said that the golf ball is moving throughout the air, we can tell that there will be air resistance and friction(air resistance is a type of friction). There is also normal force pushing on the ball as it bumps into the air, as the air is pushing back with an equal and opposite force.
I don't know what you mean by "applied", so I don't think there's that type of force exerted on the ball.
Lastly, tension only occurs when you pull a string/rope. There is no string/rope in this case, so there is no tension exerted on the ball.
I hope this helped you.
The force acting upon the golf ball which is traveling upward and rightward through the air is gravity, normal, friction, and air resistance, so options A, C, E, and F are correct.
What is friction?A force that prevents two solid objects from smoothly sliding or rolling over one another is known as friction. Despite the potential benefits of frictional forces, such as the traction needed to walk without slipping, they can still present a sizable amount of resistance to motion. Automobile engines use about 20% of their output to overcome frictional forces in moving parts.
The ball will always be affected by gravity if it is on earth. We can infer that there will be air resistance and friction because the issue said that the golf ball is traveling through the air (air resistance is a type of friction).
The air is pushing back on the ball with an equal and opposite force when it bumps into it, adding to the regular force that is pushing on it. Finally, tension can only be created by pulling a string or rope. Since there is no string or rope present, the ball is not under any tension.
Therefore, the force acting upon the golf ball which is traveling upward and rightward through the air is gravity, normal, friction, and air resistance.
To know more about Friction:
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four friends argued about why an apple on the ground eventually ros away and disappears. This is eventually what they said
Anna:"I think it's just something that happens over time
Selma: "I think small organisms use it for energy building material"
Felicia: I think the atoms and molecules in the Apple just break apart
Logan: I think wind and water soften it and it dissolves into the soil
Eli: I think water and air rot into it then small animals come and eat the rest
jack: I think it gets old and breaks apart into pieces too small to see
which student do you agree most with explain_________
Answer:
All but felicia are right I believe?
Explanation: