The frictional force opposes the forward motion of the crate. The coefficient of static friction is 0.2.
Using the formula;
Fa = - Ff + mgsinθ
but Ff = μsFN and N = mgcosθ
Hence;
Fa = mgsinθ - μsmgcosθ
μsmgcosθ = mgsinθ - Fa
μk = mgsinθ - Fa/mgcosθ
μk = coefficient of static friction = ?
Fa = horizontal force = 100N
m = mass = 30.6 kg
θ = angle = 30°
g = acceleration due to gravity = 10 m/s^2
Substituting values;
μk = [(30.6 × 10) sin 30°] - 100 / (30.6 kg × 10) cos 30°
μk = 153 - 100/265
μk = 0.2
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If you pull on a car with 200N of force, what does Newton’s 3rd Law says will happen?
Velocity:
How far would a bird travel if it is flying south for the winter at 5m/s for 1 week
Answer:
Birds in migration can travel as far as 16,000 miles. To reach their destination in time, some travel at speeds of 30mph.
A 700 g block is released from rest at height h0 above a vertical spring with spring constant k ! 400 N/m and negligible mass. The block sticks to the spring and momentarily stops after compressing the spring 19.0 cm. How much work is done (a) by the block on the spring and (b) by the spring on the block
The work done by the block on the spring and by the spring on the block is 7.22 J.
The given parameters;
mass of the block, m = 0.7 kgspring constant, k = 400 N/mextension of the spring, x = 19 cm = 0.19 mBased on law of conservation of energy, the potential energy of the block will be converted to elastic energy of the spring, producing the given extension.
The work done by the block on the spring will be equal to work done on the block by the spring.
[tex]W = \frac{1}{2} kx^2\\\\W = \frac{1}{2} \times 400 \times 0.19^2\\\\ W = 7.22 \ J[/tex]
Thus, the work done by the block on the spring and by the spring on the block is 7.22 J.
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Describe what happens when there is no Friction and you stop pushing on that object?
Describe what happens when there is Friction and you stop pushing on an object?
Are your answers to questions 1 and 2 the same? Why or why not? What causes that to be the same or different?
I give Brainliest!
Answer: see below
Explanation:
1) An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Friction opposes relative motion. In its absence, a moving object will not stop.
2) If you stop pushing, the force of kinetic friction will produce an acceleration in the opposite direction of the velocity, and the object will slow down and stop.
3) No they are not the same, as one has friction and the other has no friction.
what is needed to know in a physics exam?
Answer:
Review what you have done for that unit. Skim over it if you dont have enough time because it would greatly help. If you have mathamatics involved learn or make sure you are perfect at doing the equations you need to do. Just dont cheat because if you get caught you are going to get an imediete F which will be worse then getting half of them wrong. Good luck
How far has a ball traveled after 3.6 seconds when thrown downward at a
velocity 3.75 m/s?
ball traveled 13.5 m/s after 3.6 seconds
Explanation:
u=3.75m/s, t=3.6s, g=9.8m/s².
Therefore, according to the formula,
S=ut+½gt².
S=(3.75×3.6)+½×9.8×(3.6)²
S= 13.5+63.504
S= 77.004m (approximately 77 m)
therefore the distance traveled by the ball is 77m.
hope this helps you
A ball of mass 0.50 kg was thrown directly up at a speed of 6.0m/s.Calculate. A.its kinetic energy at 6ms^-1b.its maximum gain of potential energy. C.its maximum height gain.
ヘ（。□°）ヘヘ（。□°）ヘヘ（。□°）ヘヘ（。□°）ヘヘ（。□°）ヘ
A) Its kinetic energy be 9.0 Joule.
B) Its maximum gain of potential energy is 9.0 Joule.
C) Its maximum gain in height be 1.91 m.
What is speed?Speed is distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity With SI unit meter/second.
Given parameters:
Mass of the ball: m = 0.50 kg.
Initial speed of the ball: v = 6.0 m/s.
A) its kinetic energy at initial = 1/2mv² = 1/2 × 0.50 × 6.0² Joule = 9.0 Joule.
B) As total energy is conserved., when the ball reaches its maximum height its initial kinetic energy fully transforms into potential energy. Its maximum gain of potential energy is its kinetic energy, that is, 9.0 Joule.
C) Its maximum gain in height be = √(v²/2g) = √(6.0²/2×9.8) m = 1.91 m.
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Please help I'll mark brainliest NO LINKS
Answer:
As a capacitor is charging it takes up charging current and there's significant drop of current as the voltage increases in the capacitor.
Thus, D is the correct option.
2nd qn,
A is the correct option. Since points B, C and D are points of interaction and the force can be experienced at intervals while at A the forces will be balanced.
I WILLL MARK YOUUUUUUU HELPPPP
Acceleration due to gravity on the moon is 1.6 m/s2. If a person has a mass of 65 kg on Earth, what is their weight on the moon?
Answer:
10.75 kg
Explanation:
moon = (weight on earth/9.81m/s^2)*1.622m/s^2
Answer:
weight of the moon = mass × gravity
= 65kg × 1•6
=104N/kg
Which type of graph would best show the data collected from measuring time for a ball to fall from varying heights?
bar graph
scatter plot
Frequency table
circle graph
This is due tonight, can someone pls help me ASAP, TYSM.
Three astronauts guide a 100 kg asteroid safely away from their space capsule. The first astronaut pushes with a 35 N force directed 45 degrees below the x-axis. The second astronaut pushes with a 35 N force directed 45 degrees above the -axis. The third astronaut pushes with a 35 N force along the x-axis. Calculate the magnitude of the net force exerted by the three astronauts. Calculate the rate (magnitude only) at which the asteroid's velocity changes.
The magnitude of the net force exerted by the three astronauts is 84.5 N and the rate at which the asteroid's velocity changes is 0.845 m/s².
The given parameters;
mass of the asteroid = 100 kgforce by first astronaut = 35 N, at 45 degrees below x -axisforce by second astronaut = 35 N, at 45 degrees above x-axisforce by third astronaut = 35 N, at 0 degrees on x-axisThe resultant horizontal force applied by the three astronauts on the asteroid is calculated as;
Fₓ = 35cos(45) + 35cos(45) + 35cos(0)
Fₓ = 84.5 N
The rate at which the asteroid's velocity changes is calculated as;
[tex]F = ma = m\frac{\Delta v}{\Delta t} \\\\\frac{\Delta v}{\Delta t} = \frac{F}{m} \\\\\frac{\Delta v}{\Delta t} = \frac{84.5}{100} \\\\\frac{\Delta v}{\Delta t} = 0.845 \ m/s^2[/tex]
Thus, the magnitude of the net force exerted by the three astronauts is 84.5 N and the rate at which the asteroid's velocity changes is 0.845 m/s².
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Which of the following is not part of the forces that work together to move the tectonic plates?
-mantle convection
-ridge push
-slab pull
-friction
creo que soy yo pero lo veo en ingles
An Eider duck is flying Northeast at 25 m/s at an angle of 36.9 degrees to the ground (from the positive
X-axis). What are the horizontal and vertical velocities, respectively, of the duck's flight?
Answer:
Horizontal = 19.99212 m/s Vertical = 15.0151 m/s
Explanation:
Horizontal = Cos(36.9) x 25
Vertical = Sin(36.9) x 25
3. There is a thin layer of water between the blade and the ice. Suggest how this affects friction and helps the skater? .
Explanation:
Underneath the blade of skates, there is a thin layer of water from the melted ice. ... This water then acts as a lubricant (something whose purpose is decreasing friction), resulting in a smooth motion of the skates over the ice.
Please help I'll mark brainliest NO LINKS
Answer:
D
Explanation:
I had the question on an exam, I answered D and I got 97% on the test, I got it correct with the answer of D. TO be fair I guessed on the test and got it right, lucky guess I suppose.
Answer:
According to electrostatic concept the electric potential will be toward the negative charge and the coulomb force will be directed towards the negative charge.
Due to that 4 is the correct option.
That's what I think, all the best!
What is the quantity that is the same for all masses?
Answer:
mass: The quantity of matter which a body contains, irrespective of its bulk or volume. It is one of four fundamental properties of matter. It is measured in kilograms in the SI system of measurement.
Explanation:
please give brainliest plz followIf a male runner in the fourth starting position ran the 400 m race in 44.40 s, how would you
calculate his average speed?
If a male runner in the fourth starting position ran the 400 m race in 44.40 s, then for calculating his average speed we have to divide the total distance covered by the time taken by him to cover the distance.
His average speed would be 9.0 meters/second.
What is speed?The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object. The unit of speed is a meter/second. The generally considered unit for speed is a meter per second.
The mathematical expression for speed is given by
speed = total distance /Total time
If a male runner in the fourth starting position completed the 400 m race in 44.40 s, we must divide the total distance traveled by the amount of time it took him to complete the course to get his average pace.
the average speed of the runner = 400 meters/44.40 seconds
= 9.0 meters/second
Thus, his average speed.be his average speed would be 9.0 meters per second
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Isaac attempts to kick a field goal from the 40 yard line. He kicks the football at 38 m/s at a 50° angle above horizontal. If the football reaches the goal post at 3/4 of the horizontal distance kicked, then will it be high enough to cross the goal post that is 3.66 m high?
Please help asap!
Answer: Solution In photo
1 thing you learned about your culture that you did not know
Answer: That There are diffrent names for my skin color
Explanation:
If a 2kg block of copper is heated and a temperature increase of 50C is measured, how much energy has been provided?
Answer:
...................
saya gk tau
If a truck weighs 195,000N what is the mass of the truck
Answer:
19500kg
Explanation:
If you divide 195000N by 10
5 . W h ic h o f th e fo l lo w in g is N O T a fu n d a m e n ta l S .I u n it? A . M e te r B . A m p e re C . K e lv in D . Radian
Explanation:
it is an AMPERE
because 1 AMPERE = CHARGE / TIME
WHICH INVOLVES 2 UNITS
how long does it take the star and planet to complete one orbit around their center of mass?
Answer:
i think about 225-250 million years
Explanation:
Bottom line: The planets in our solar system orbit (revolve) around the sun, and the sun orbits (revolves) around the center of the Milky Way galaxy. We take about 225-250 million years to revolve once around the galaxy's center. This length of time is called a cosmic year.
What type of forces are needed in a system for the object to move?
Answer:
they are
Explanation:
1.Frictional force
2.Applied force
3.Normal force
The ______ describes the number of wavelengths that pass through a fixed point in a given period.
Answer:
frequency
Explanation:
Frequency refers to the number of waves that pass a given point in a given time period and is often expressed in terms of hertz (Hz), or cycles per second. Longer wavelengths will have lower frequencies, and shorter wavelengths will have higher frequencies ([link])
the circuit contains a filament bulb, connected with ........ to a ........
fill in the blanks.
Answer:
The circuit contains a filament bulb, connected with terminal to a terminal.
Explanation:
The base of the electric bulb and the metal tip of the base are the two terminals of the bulb. One is called a positive terminal while the other is called a negative terminal. The filament of the electric bulb is connected to its terminals.
CAN U PLS CHECK IF IT CORRECT I'LL MARK YOU BRAINLIST
Answer:
l think that the answer is 10.hope this helps . Can you mark me the brainest pliz.lt's LAURA RAYS AMIRA.
Answer:
Explanation:
700-40 = 760
760/10 = 76
It will take her 76 days to finish the book
the energy stored in chemical bonds *
Answer:
Chemical energy (Also considered potential energy)
Explanation:
INQUIRY LAB
HOW DO You Breathe?
Use and manipulate an improvised breathing apparatus similar to the
one shown at the right in answering the following questions:
Pull down the string attached to the center Of the large balloon.
1.What happened to the two small balloons attached to the capillary tube?
2.When the large balloon is not yet stretched or pulled down, how do the two small balloo
appear?
3.How does the improvised breathing apparatus simulate the breathing process?
plss can u help me with thiss its realy a lot of help THANK YOU SO MUCHH
Answer:
u breathe lol nice ok bro
1. a conductor carries a current that is decreasing exponentially with time. the current is modeled as where is the current at time and is the time constant. how much charge flows through the conductor between and ?
Explanation:
what is the colour of our blood
Answer:
Q = Q0exp -t/RC
Explanation:
Q0 initial chage
RC time constant
t time