IMPORTANT QUESTIONS1. Write the three equations of motion.
2. In which condition distance and displacement are equal?
3. Is acceleration scalar or vector?
4. What is the difference between mass and weight?
5. What is the difference between 'G' and 'g'?
6. Why can't you feel an attraction force between you and your friend?
7. Uniform circular motion is accelerated motion Why?
8. What is the weight of a person in the surface of moon?
9. A ship is moving at a speed of 56km/h. one second later, it is moving at 58km/h. What is its
acceleration?
10. What is the area under velocity-time graph gives?
11. Explain the use of seat belt in car.
12. Why the school bags have wide strap?
13. Camel can easily walk through the desert. Why?
14. Draw the following displacement-time graphs represent cases
a. Stationary object
b. Uniform motion
c. No uniform motion
15. Draw the following speed-time graphs represent cases
a constant speed
b. speed decreasing uniformly
c. speed increasing uniformly
Answers
Answer:
1) v = u + at
s = ut + 1/2 at²
v² = u² + 2as
2) The distance is equal to the displacement when their magnitude is the same.
3) Acceleration is a vector quantity
4) Mass is the quantity of matter present in a body. Its SI unit is Kg. The weight is the action of gravitational force on the body. Its SI unit is newton.
5) G - Universal gravitational constant (6.673 x 10⁻¹¹ Nm²Kg⁻²
g - acceleration due to gravity (9.8 m/s²)
6) It is because the magnitude of the attractive force between two people is negligible when compared with the gravitational force of Earth.
7) In a uniform circular motion, the body is continuously changing its direction. If there is a change in the direction there is an act of force acting on the body. It will in accelerated motion.
8) Due to the lesser gravitational force of the moon, the weight of the person on the moon is very low compared with the weight of the person on Earth. On the surface of the moon, the person will experience only 16.5% of his weight on the Earth.
9) The rate of change of velocity by time gives acceleration. Therefore the acceleration of the ship is when the velocity is converted to m/s
a = (16.11 - 15.56)/1
a = 0.55 m/s²
10) The area is equal to the displacement
11) The seat belt stops the movement of a body where newton's first law is applicable.
12) The pressure acting on a body is inversely proportional to the surface area. So, when the surface area is the increased impact of pressure on the shoulders can be minimized. So, the schoolbags have wider straps.
13) The camels have broader toe compared to the toe of the horse. So, it can walk easily through the sands.
Related Questions
The space shuttle is located exactly half way between the earth and the moon. Which statement is true regarding the gravitational pull on the shuttle?
The park has added two more cars to the already existing roller coaster. If the park wants to maintain the speed of the roller coaster with the addition of the cars, what must it do? A) Increase the height a point A. B) Increase the heights at point A and B. C) Reduce the number of hills and dips in the course. D) Increase the friction between the wheels and the track.
the weight of an object on a planet depends not only on its mass, but also on its distance from the planets center. This table lists the weight of 80 kg on each planet in the solar system. Uranus has more than 14 times as much mass as Earth, yet the gravitational force is less. Explain how this could be
Name one other organ system that would be affected if you had no marrow. Explain.
88.0 %
12.0 %
11.0 %
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Answer:
Hello! the efficiency of a thermal engine depends on how much of the initial input is transformed into work, Here 270°c is the input and 210°c is the output.
Then the efficiency is calculated as e = 1 - Tc/Th, where Th is the hot temperature (in this case 270°C) and Tc is the cold temperature (in this case 210°C)
First we need to write the temperatures in kelvin degrees, this can be done by adding 273.15 to the celsius scale:
Th = 270 + 273.15 = 543.15
Tc = 210 +273.15 = 483.15
then the efficiency is e = 1 - 543.15/483.15 = 0.11
if we write this as a percentage, we get an efficiency of 11%, then the fourth answer is the correct one.
Answer:
Given:
Th = 270 °C = 270+273 = 543 K, hot temperature
Tc = 210 °C = 210+273 = 363 K, cold temperature
According to the Carnot theorem, the maximum efficiency achievable by a heat engine between a hot and cold temperature is
η = 1 - Tc/Th
= 1 - 363/543
= 0.668 = 11.047 (approx)
Answer: 11.0% (nearest integer)
B. Highly viscous and associated with quiet volcanic eruptions
C. Stays deep within earth because of low viscosity
D. Cannot flow but is limited to fixed areas of hotspot volcanism
Answers
Answer: Option (A)
Explanation: Silica rich magma are those in which the magma has more than 65 % of silica content. The higher the silica content, the higher is its viscosity i.e viscosity of a magma is directly proportional to the silica content of magma.
This highly viscous magma inside the volcanoes moves sluggishly and mostly gets concentrated in the vents and seals them. With time, when the pressure exerted by the magma is too high, it creates violent eruptions through the vents.
Thus, the correct answer is option (A).
Answer:
A. Highly viscous and associated with violent eruptions
Explanation:
Most silica rich magma have high viscosity and huge amount of trapped gases within them. As they continue to upwell and expand, the gases causes violent eruptions near Volcanoes. Most granitic/rhyolitic magma are silica rich.
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Hope this helps
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A nitrogen atom contains 7 protons, 7 electrons and 7 neutrons.
What are Electrons, protons and Neutrons?
Electrons are defined as subatomic particles with a negative elementary electric charge that belong to the first generation of the lepton particle family, and are considered elementary particles because they have no known constituents or substructures.
A proton is defined as a stable subatomic particle, symbol p, H⁺, or ¹H⁺, having a positive electric charge of +1 e elementary charge, with a mass slightly less than that of a neutron and the mass of an electron is 1,836 times.
A neutron is defined as a subatomic particle found in the nucleus of every atom except simple hydrogen, where the particle derives its name from the fact that it has no electric charge as it is neutral. Neutrons are very dense. Atoms contains same number of protons, electrons and neutrons like in nitrogen.
Thus, a nitrogen atom contains 7 protons, 7 electrons and 7 neutrons.
Learn more about Electrons, here:
#SPJ2
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Second body:
From description of the task we have: