The coefficient of kinetic friction between the block and the horizontal surface will be 1.597.
What is kinetic friction?A force that acts among sliding parts is referred to as kinetic friction. A body moving on the surface is subjected to a force that opposes its progressive motion.
The given data in the problem is;
μ is the coefficient of kinetic friction=?
m is the mass of the block=10 kg
g is the acceleration due to gravity= 9.81 m/s²
Acceleration of block(a)=20 m/s²
Force (F)= 50 N
θ=30°
There are two forces to act on the block, one is the force directed while the other was the friction force opposing the motion.
From the newton's second law;
F= ma
F-f = ma
Fcos30°- μmg=ma
50cos 30°-μ× 10×9.81 =10 × 20
μ= 1.597
Hence, the coefficient of kinetic friction will be 1.597.
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A bag of frozen vegetables expanding in the microwave is a good example of how volume __________.
A. increases when temperature decreases
B. decreases when temperature increases
C. decreases when temperature decreases
D. increases when temperature increases
Answer:
D
Explanation:
because when the temperature increases things tend to rise and explode instead of decreasing
DOES THE SUN CONTAIN NUCLEAR ENERGY?
Answer: yes
Explanation: it's fueled by nuclear reactions that fuse hydrogen atoms together into helium and other heavier elements, releasing huge amounts of energy in the process.
How much does a 200 kg car weight?
Answer:
22 kgs
Explanation:
440.925 pounds if thats what you mean but kgs is the weight system for everyone but america
A force of 800 n is used to stop an object with a mass of 50 kg moving with a velocity of 35 m/s. how long will it take to stop this object?
variables:
equations:
answers
Answer:
KE = F * S initial kinetic energy will expended in stopping object
1/2 M V^2 = F * S
S = 1/2 * 50 * 35^2 / 800 = 38.3 m stopping distance
If you need to know the stopping time involved -
(V2 - V1) = a t where the change in velocity is 35 m/s
a = F / M = 800 / 50 = 16 m/s^2 deceleration of mass
t = 35 / 16 = 2.2 sec
Warren is a professional triathlete when doing an
Ironman, Warren swims 3.86km in 45 mins, then
bikes for 180.5 km in 5 hours and finishes by
running a marathon 42.2km in 2.75 hours. What is
Warren's average speed in Km/hr and m/s
Answer:26.7 and 7.4
Explanation:
So, first you add all the time up then the area travelled.
Firstly; 45 mins + 300 minutes(5 hours) + 165 minutes(2.75 minutes)= 510 minutes
Secondly; 42.2KM + 180.5KM + 3.86KM= 226.56KM
Finally: For hourly you would do: 510 divided by 60 to get 510 mins in terms of hours: so, 8.5 hours then you would do 226.56KM divided by 8.5 hours to get: 26.7Km/hr
For m/s: 7.4m/s
what are the characteristics of images formed by plane mirrors
Answer:
the image is erectthe image is laterally invertedimage is formed at the same distance from the mirror as the object is in front of itthe image is of same size as that of the objectthe image is virtual (cannot be obtained on a screen)
Question 12 A wave has a wavelength of 7.96 m and travels at 30.67 m/s. What is the frequency of the wave?
Answer:
0.2597hertz
Explanation:
first of all we have to calculate time.
time is given by speed/distance
hence=30.67/7.96
=3.85s
frequency is given by 1/time
=1/3.85
=0.2597hertz
explain the causes of atmospheric pressure and why it changes with altitude?
Answer:
As altitude increases, the amount of gas molecules in the air decreases—the air becomes less dense than air nearer to sea level. This is what meteorologists and mountaineers mean by "thin air." Thin air exerts less pressure than air at a lower altitude
The half-life of radium-226 is 1,600 years and the half-life of carbon-14 is 5,730 years. In 1-2 sentences, mathematically prove that the decay constant for radium-226 is larger than the decay constant for carbon-14.
The decay constant for radium-226 is larger than the decay constant for carbon-14 due to its obtained value.
What is the rate of decay?
The reduction in the number of radionuclides per unit time is the rate of decay.
The decay constant of the radium-226 is;
[tex]\lambda_1=\frac{ 16}{100}\times 266 \\\\ \lambda_1= -36.16[/tex]
The decay constant of the carbon-14 is;
[tex]\lambda_2=\frac{ -57.3}{100}\times 14 \\\\ \lambda_1= -802.2[/tex]
Hence, the decay constant for radium-226 is larger than the decay constant for carbon-14.
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Answer:
0.693/1600 > 0.693/5730
Explanation:
The decay constant is the reciprocal of the time it takes for the radioactivity to decline to about 36.8% of its original value. It is the value of k in the multiplier e^(-kt), which tells the fraction remaining after time t.
When compared to the half-life, h, the value of k is ...
k = 0.693/h . . . . . decay constant for half-life h
Effectively, the decay constant is proportional to the inverse of the half-life. The constant of proportionality is ln(2) ≈ 0.693.
__
decay constant for radium-226:
0.693/1600 ≈ 4.33×10^-4
decay constant for carbon-14:
0.693/5730 ≈ 1.21×10^-4
Since 4.33×10^-4 is greater than 1.21×10^-4, the decay constant of radium-226 is larger than that of carbon-14.
_____
Additional comment
Taking the reciprocal of a positive number reverses the ordering:
1600 < 5730
1/1600 > 1/5730
The half-life of radium-226 is less than that of carbon-14, so its decay constant will be larger.
Calculate the power if work is 9000 joules and time is 60 seconds
Answer:
150w
Explanation:
power = workdone/time
9000/60
150w
3. The distance from a makeup mirror to C (the radius of curvature) is 70 cm. How far from the mirror
can a person be and still see an upright, magnified image?
The far point from the mirror can a person be and still see an upright, magnified image is focus i.e. 35cm from mirror.
What is radius of curvature?The mirror is made out of a sphere which has its radius called the radius of curvature.
The focal length f is half of the radius of curvature R of the lens.
Given the radius of curvature is 70cm, then focal length will be 70/2 = 35cm.
The makeup mirror is a concave mirror which forms real and upright images. The magnified images are obtained when the object is placed between focus and mirror.
Thus, the far point is focus i.e. 35cm from mirror.
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Any sound with a frequency that is too low for humans to hear is called:
Answer:
infrasound
Explanation:
2. why did adding layers of paper help prevent the egg from breaking open rather than one thick layer with the same number of sheets?
Which type of energy is most important when considering the heating and cooling of a building?
A. thermal energy
B. chemical energy
C. potential energy
D. electrical energy
Heating and cooling are the kind of energy. The most important energy when considering the heating and cooling of a building is thermal energy. The correct option is A.
What is energy?Energy is the ability to do work.
The temperature of building is increased or decreased due to the season changes. This heating or cooling is a type of energy related to thermal.
Thus, the most important energy when considering the heating and cooling of a building is thermal energy. The correct option is A.
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What is the difference between
longitudinal waves that have
different amplitudes?
Answer:
Wave amplitude of a transverse wave is the difference of height between a crest and the resting position. Wave amplitude of a longitudinal wave is the distance between particles of the medium where it is currently compressed by the wave.
Answer:
A wave caused by a disturbance with more energy has greater amplitude
Explanation:
Calculate the frequency of a wave which goes through 10 cycles in 5 s
Which picture shows an example of no work being done? A man and a woman hold a child in the air by the child's hands. A man pushes a shopping cart down the aisle of a grocery store. A child holds the bar of a set of weights without moving. A woman pulls a rolling suitcase.
Answer:
A child holds the bar of a set of weights without moving I think
How energy efficiency can reduce energy consumption?
Answer:
The energy efficiency represents the things you can do with some amount of energy, and if you can do more with less, than it reduces the energy consumption.
Explanation:
The answer to this question is actually very simple. Imagine that you use only the half of the energy you produce, an efficiency of 50%. Lets say you need 5kJ, so you would need to produce 10kJ, because you can consume only the half. Now, imagine you increase the efficiency, you use exactly what you can generate, (efficiency of 100%). In this case, if you needed only 5kJ you would need to generate only 5kJ.
After reading the passage about acupuncture, identify which scientific claim explains why some people say acupuncture does not truly relieve pain.
Answer:
The answer would be "This ancient form of pain relief and stimulation is said to benefit patients by blocking channels which practitioners claim
Explanation:
Answer:
It provides only a placebo effect.
Explanation:
Edge
a racing car has a uniform acceleration of 5 metre per second square what distance will it cover in 10 seconds after the start
will mark as brainlist
what is the wavelength of a 28Hz periodic wave at 10 meters per second?
AnswerAnswerAnswerAnswerAnswer:0.3571m
Explanation:
Can someone please answer this, ill give you brainliest Would be very appreciated.
Answer:
c because
Explanation:
Plants and trees couldn't thrive without capillary action. Capillary action helps bring water up into the roots. With the help of adhesion and cohesion, water can work it's way all the way up to the branches and leaves.
Answer:
option C
Explanation:
Capillary action is important because it's necessary thing in plants food and oxygen productionIt is done through capillary tubes of diameter 0.1mm and the water rises up high in the trees.So option C is correct
What is physics and how does it affect every day life
Explanation:
Physics, or the study of matter, energy, and the interactions between them, helps us to understand the laws and rules that govern the physical world.
A set of water waves travels at 10.0 m/s , and 5.0 waves pass you in 4.0 s. What is the wavelength of the waves?
Answer:
8 meters
Explanation:
Frequency of waves = 5 waves / 4 s = 1.25 Hz
speed = frequency * wavelength
speed/ frequency = wavelength
10 / 1.25 = 8 m
Which components of static electricity does a photocopier use?
ex. charging by conduction, friction, etc
Answer:
For a photocopier to work, a field of positive charges must be generated on the surface of both the drum and the copy paper. These tasks are accomplished by the corona wires. These wires are subjected to a high voltage, which they subsequently transfer to the drum and paper in the form of static electricity.
what is the difference between reflection and refraction? What changes and what does not change.
Answer:
Reflection involves a change in direction of waves when they bounce off a barrier. Refraction of waves involves a change in the direction of waves as they pass from one medium to another.
Explanation:
A gas has a variable volume.
True
False
Answer:
True
Explanation:
Gas always live in free state but some gas is not . We can said that mostly gas volume can be changeable during disturbing by environment situation.
The amount an object weighs depends on the presence of —.
Answer:
The weight of an object is dependent upon the value of the acceleration of gravity.
the amount of energy at the end of the system (output) is different from the starting energy (input). How does this not violate (break) the law of the conservation of energy. This question is based on solar and wind energy
Answer:
Because some of the energy escaped or was used.
Explanation:
What is needed for water condensation to occur
Answer:
Warm moist air, hope this helps
Answer:
A heat source high enough to boil the water and the water itself
Explanation: