Question:
A block of mass 1kg is placed on an inclined plane at an angle of 30° to the horizontal. Calculate the frictional force, normal reaction, the coefficient of the static friction
Answer:
Break the mg force into components in the plane of the inclined plank. Now force acting parallel is mgsin37°. Perpendicular force is mgcos37° which is equal to normal force.
Now calculate max value of friction force which is 0.8*mg cos37°. Since its greater than pulling force mgsin37°, the body will be at rest and acceleration is zero.
Force applied by surface is vector sum of normal force and friction force acting.
What is the total distance travelled? What is the displacement of the object?
Hi there!
Distance and displacement are different.
Distance is WITHOUT direction (scalar quantity)
Displacement TAKES INTO ACCOUNT direction (vector quantity), and is RELATIVE to the initial point.
DISTANCE:
Add up each segment's position:
0 - 2 sec: 0 m
2 - 5 sec: 10 - 4 = 6 m
5 - 6 sec: 0 m
6 - 8 sec: 10 - 2 = 8 m
8 - 9 sec: 0 m
9 - 12 sec: 5 - 2 = 3 m
Add up:
6 + 8 + 3 = 17 m
DISPLACEMENT:
To find displacement, simply look at the position at the final point (t = 12 sec) and compare to the initial position:
At t = 12: Position = 5 m
At t = 0: Position = 4 m
5 - 4 = 1 m
What are at least 3 examples of sublimation?
Sublimation is solid skipping the melting to a liquid stage andngoing staright to a solid.
Answer:
dry ice, air fresheners, polar evaporation, arsenic treatment
Su una strada rettilinea ci sono due semafori che distano 98 m e che diventano verdi contemporaneamente. Dal primo semaforo parte un’auto che sì muove alla velocità costante di 43 km/h; dall’altro semaforo parte, nel verso opposto, un camper che viaggia alla velocità costante di 36 km/h.
Determina quanto tempo dopo l'accensione del verde i due automezzi sì affiancano e quanta strada ha percorso l'automobile in quel momento.
Answer:
Le due rette rappresentano le leggi del moto di due punti
materiali (per esempio due macchine) che si muovono di moto
rettilineo uniforme. La retta meno pendente (velocità più bassa)
è riferita alla macchina che parte da una posizione iniziale più
avanti rispetto alla seconda macchina. Però, la seconda
macchina, avendo una velocità maggiore della prima (retta più
pendente), nonostante parta più indietro rispetto alla prima, dopo
un certo tempo la raggiungerà. Pertanto, il punto P, intersezione
delle due rette, rappresenta la situazione fisica in cui la seconda
macchina raggiunge la prima. In particolare, le coordinate del
punto P (tempo e spazio), rappresentano l’istante e la posizione
in cui la seconda macchina raggiunge la prima.
Please guide me for uniform speed
Explanation:
uniform speed is just the consistent ratio of distance to time. it can a
so be thought as the speed of an object that does not change. an example is when a car moves at a speed of 60km/hrs without changing its speed. it keeps on moving at the same speed it started with
hope this becomes helpful
thanks
Students take measurements of the force F0 , directed to the left, needed to hold the cart in place as well as the tension FT in the horizontal section of string. The students take three measurements for each force. Write down the sets of measurements that would provide the most precise determination of the correct relationship between the net force and the vector sum of the individual forces exerted on the cart?
The characteristics of the random error allow to find the result for the best value of the forces is:
Using the average values gives the best results.
In a measurement in physics some type of instrument is used, therefore all measurements have a precision due to the minimum amount that can be measured with the given instrument, the correct way to give the measurement is
m = m ± Δm
Where m is the measure and Δm the error due to the appreciation of the instrument.
In the measurement process there are variables type that can affect the results, in general they can be divided into two groups:
Systematic errors. They are problems that can be reduced or solved, in general they move the result to a specific side, for example: calibration problems, problems with the measurement method, etc. Random errors. They are variables that change during the measurement that cannot be foreseen or controlled, for example: temperature, humidity, deformation of bodies, etc.
Statistical methods can be applied to the random type of processes to reduce their effect on the final result, one of the most efficient way is to carry out the measurement several times and since the errors are random, if we obtain the average it must be closer to the true value.
[tex]m_{average} = \frac{\sum m_i}{n}[/tex]
Where m_i is each measurement and n is the number of measurements.
As a result it is
[tex]m = m_{average} \pm \sigma[/tex]
Where σ is the standard deviation.
It indicates that three measurements were made of each force, suppose that their values are: F₀₁, F₀₂ and F₀₃, and the best value is
[tex]F_{o \ average} = \frac{1}{3} (F_{o1} + F_{o2} + F_{o3} )[/tex]
For the tension of the body also takes three measurements.
[tex]F_{t \ averag} = \frac{1}{3} (F_{t1} + F_{t2} + F_{t3} )[/tex]
The best value of the net forces should be obtained using the average values.
[tex]\Delta F = F_{t \ average} - F_{o \ average}[/tex]
In conclusion using the characteristics of the random error we can find the result for the best value of the forces is:
Using the average values gives the best results.
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How much work is done on an object that is moved to acquire a displacement of 5 meters when 500 Newtons of force was exerted?
Answer:
2,500 Joules (J) or Newton Meter (N M)
Explanation:
Work = Force x Distance
The force in this equation is 500 Newtons. The distance (displacement) is 5 meters. Plug it into the equation above.
Work = 5m x 500n
Work = 2,500 Joules or Newton-Meters.
Therefore 2,500 Joules or Newton Meters of work is done on an object.
A new model BMW can start from rest and travel 400 m in 16 s. a. What is its acceleration during this time? [2] b. Calculate the final speed of the car. [2] c. How fast is this final speed in km/h?
Answer:
acceleration = 3v 125 m/s^
final speed= 50 m/s
final speed in km/hr = 180 km/hr
Explanation:
A new model BMW can start from rest and travel 400 m in 16 s.then the acceleration during this time would be 1.5625 m/s²
What are the three equations of motion?There are three equations of motion given by Newton
The first equation is given as follows
v = u + at
the second equation is given as follows
S = ut + 1/2×a×t²
the third equation is given as follows
v² - u² = 2×a×s
As given in the problem, A new model BMW can start from rest and travel 400 m in 16 s
distance covered by BMW = 400meters
initial velocity(u) = 0 m/s
time = 16 seconds
acceleration(a) =? m/s²
By using the second equation of motion given by newton
S = ut + 1/2at²
S = 400 m ,u= 0 m/s , and t =16seconds
400 = 0 + a16²
a =400/256
a = 1.5625 m/s²
For the final speed of the car
v= u + at
v = 0 + 1.5625×16
v = 25 m/s
For calculating the speed in km /h
v = 25 ×3600/1000
= 90 km/h
Thus, the acceleration during the first 16 s time would be 1.5625 m/s²
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I NEED THE RIGHT ANSWER ASAP IT NEEDS TO BE 100% ACCURATE NO LINKS !!!
What happens when multiple forces act on an object?
1: The object will move if the forces are unbalanced.
2: The object will always stay in place.
3: The object will always move.
4: The object will move if the forces are balanced.
Answer:
The object will move if forces are unbalanced
1-Atoms with few valence electrons
tend to lose them and then the next
energy will be the outer level and it is
full. This is more stable for the atom.
Remember that atoms are neutral,
which means that they have the
same number of positive protons and
negative electrons. If an electron is
lost, the atom will no longer be
neutral. What will happen to the
valence electron of Na and what will
it form? What will the resulting
charge be?
Answer:
An atom that loses one or more valence electrons to become a positively charged ion is known as a cation, while an atom that gains electrons and becomes negatively charged is known as an anion.
Explanation:
Atoms that lose electrons acquire a positive charge as a result because they are left with fewer negatively charged electrons to balance the positive charges of the protons in the nucleus.
I'm not sure whether it is electrically, by radiation or by heating?
thanks:)
WILL MARK BRAINLIEST
HELPPPPPOPP
Sam is walking down the street. He walks 10 meters in 120 seconds. Assuming he does not speed up or
slow down, what is his speed in meters per second?
Explanation:
v(speed)=10/120=0.08m/s
Answer:
0.08
Explanation:
10/120 = 0.08
I hope this helps!
I NEED THE RIGHT ANSWER ASAP IT NEEDS TO BE 100% ACCURATE NO LINKS !!!
Which type of force will an object move towards?
1: weakest
2: net
3: balanced
4: strongest
Answer:
Strongest
Explanation:
100% correct
An object has an acceleration of 12.0 m/s/s. If the net force
acting upon this object were tripled, then its new acceleration
would be m/s/s.
Answer:
F=ma
Explanation: Let X stand for the new acceleration with the tripled force.
F = m*(12.0 m/s/s)
3F = m*(X)
3F = 3*m*(12.0 m/s/s)
3F = m*(X)
3F = m*(3*12.0 m/s/s)
X = (3*12.0 m/s/s)
a for 3X the force is = (3*12.0 m/s/s), or 36.0 m/s/s
what do the astrometric, doppler, and transit methods share in common?
They all search for planets by measuring properties of a star rather than of the planets themselves. ... The size of the Doppler shift that we detect depends on the tilt of a planet's orbit.
Everything in the physical universe is composed of matter which has mass and occupies space.
True or False?
PLEASE I NEED HELP FAST
Answer:
Its True
Explanation:
hope this helps
Common sports injury : ankle sprain , bone fracture , muscle strain , neck low back pain , shoulder pain. First aid needed
Answer:
m
Explanation:
explain about anomalous expansion of water
Answer:
When the temperature drops from 0°C to 4°C, water expands instead of contracting, resulting in a reduction in density. In solid form, water molecules normally form open crystal structures, so as they freeze, their density decreases.
When liquids cool, they constrict and become denser. This is not the case with water. Upon cooling to 4°C, it contracts, but upon reaching 0°C, it begins to expand and becomes ice. Thus, it becomes denser as it cools.
Find the displacement the body in the following graph
Answer:
150
Explanation:
15m/s×10s= 15m/a
and that is the correct answer
1) ¿Cuáles son los
beneficios de lograr
niveles aceptables de
aptitud física
relacionada con las
habilidades?
Answer: Controlar el sobrepeso bajas grasa , te pone de buen homor , te da mas energia , Te ayuda mantenerte saludable y combatir enfermedades.
true or false sliding friction is stronger than static friction
Answer:False static friction helps us from not sliding it hold us.
Explanation:
Increased levels of oxygen in the atmosphere due to photosynthesis caused rates of weathering to____
which aided in the formation of____
1. A.Increase
B. Decrease
C. Remain constant
2. A. Chloroplast
B. Roots
C. Soil
Increased levels of oxygen in the atmosphere due to photosynthesis caused rates of weathering to increases which aided in the formation of soil.
What is photosynthesis ?The process in which use of solar energy occur by plants, algae and certain bacteria convert them into chemical energy and starch called as photosynthesis.
Photosynthesis occur in chloroplast of the green plant which has its own DNA, genes and synthesize their own proteins.
photosynthetic Pigments are also involve in this process which is responsible for trapping sunlight present in chlorophyll pigment of chloroplast, like chlorophyll a, b and c.
some of the Bacteria have chlorophyll known as bacteriochlorophyll which can absorb infrared rays, Carotenoids which are yellow, orange or red-coloured pigments that absorb bluish-green light., Xanthophyll, Phycobilins.
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Using the data provided in the graph and the table, interpolate to find the potential energy (U) at a height (H) of 2.5 meters and extrapolate to find the potential energy at a height of 4.5 meters.
At 2.5 meters, the potential energy would be 45 joules, and at 4.5 meters, it would be 85 joules.
At 2.5 meters, the potential energy would be 50 joules, and at 4.5 meters, it would be 90 joules.
At 2.5 meters, the potential energy would be 55 joules, and at 4.5 meters, it would be 95 joules.
At 2.5 meters, the potential energy would be 70 joules, and at 4.5 meters, it would be 100 joules.
At first, wave A and wave B are identical. Then, wave A passes through a wooden table and wave B passes through a swimming pool. Which of the following is true about the waves AFTER they encountered different media?
Wave A and B have the same speed.
Wave B has a faster speed than wave A.
Wave A has a faster speed than wave B.
There is not enough information to tell.
Answer:
Hey there
A) wave A and B have the same speed.
When they return to the air they will have the same speed. Yes they did have different speeds in water and wood but now they are back in air ("AFTER they encountered different media").
a boy cycles a distance of 960 m from home to school in 8 minutes. calculate his average speed for the journey
120m per minute
Explanation:If you take 960 and divide it by 8 you get 120 then you have the answer 120m per minute
5 cm ______ 500 mm.
a) Is greater than
b) Is less than
c) Is equal to
d) Measures a different quantity than
Answer:b
Explanation: each cm is 10mm so 5cm is 50mm that is less than 500mm
Physical science includes
chemistry.
life science.
physics.
two of the above.
How does acceleration experienced by different objects compare based on their masses?
I give Brainliest!
Answer:
The acceleration of an item is proportional to the net force exerted on it and inversely proportional to its mass. The acceleration of an item increases as the force pressing on it increases. The acceleration of an item decreases as the mass of the thing increases.
bro i need help omg.
Answer:
25.
Explanation:
5
because you're taking off the front number which is one
The distance from the Moon to Earth is 3.9 x 10^8 meters. What is the time required for a light ray to travel from the Moon to Earth?
Given what we know about the speed of light, we can confirm that a single ray of light would take 1.3 seconds to travel from the Moon to the Earth.
What is the Speed of Light?The speed of light, as the name suggests, is the speed at which light travels. It has a value of over 299 million meters per second.It is considered the fastest that it is possible to travel, nothing is known to travel faster than light.Therefore, since the Moon sits at a distance of 390 million meters from the Earth, and the fact that light travels at approximately 300 million meters per second, we can confirm that light from the moon takes roughly 1.3 seconds to reach Earth.
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Which of the following is same dimension quantity?
Work and Power
power and Potential energy
Potential energy and Pressure
Potential energy and Work
Answer:
Find the dimension of each and every quantity in all the options to check whether they are the same or not. We can use any one formula of each identity to find its dimension.
Complete step by step solution:
To find the dimension of a quantity, we can use any formula related to that quantity but we will use the easiest ones to save time.
Force-
from Newton’s law of motion,
F=maF=ma
Dimension of force =[M][LT−2]=[MLT−2]=[M][LT−2]=[MLT−2]
Work done-
W=F×sW=F×s
Dimension of work=[MLT−2][L]=[ML2T−2]=[MLT−2][L]=[ML2T−2]
Momentum-
p=mvp=mv
Dimension of momentum=[M][LT1]=[MLT−1]=[M][LT1]=[MLT−1]
Impulse-
I=F×tI=F×t
Dimension of impulse=[MLT−2][T]=[