The Law of Gravitation was mathematically defined by who?
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Related Questions
Which of the following is NOT supported by Newton's Second Law?1 The mass of an object will change depending on the force acting on it2 The greater the force applied on an object, the greater it's acceleration3 You can find the mass of an object if you know it's acceleration and the forces acting on it4 Force is equal to the product of mass and acceleration
What are the importance of physics
What kind of image is formed by a convex lens when the object is less than a focal length away from the object?A) an image that is always smaller than the object B) none, because the lens is too close to the object C) a virtual image D) an inverted real image
The curved movement of air or water is the result of which of these?Select one: a. winds spinning off the equator b. the rotation of Earth on its axis c. the different air movements north and south of the equator d. the friction that slows down winds near Earth’s surface
insulator
semiconductor
superconductor
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Answer:
An insulator
Explanation:
Insulators have a very high resistance because the electrons of the insulator are bounded strongly with the nucleus. Hence it requires more voltage to move an electron from the valence band to the conduction band.
b. Lithium
c. Nitrogen
d. Magnesium
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B.lithium has 1
C.nitrogen has either 5 or 3 because it bonds outer orbital
D.magnesium has 2
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ball drops 45m under g=10m/s/s
45=1/2x10xt^2 ... application of kinematic equaion from rest
90/10=t^2
t=3
24.0 m in 3 secs => 8m/s no air resistance
Final answer:
The ball's initial speed is calculated using the principles of projectile motion. First, the time it takes for the ball to hit the ground is found using the vertical distance and acceleration due to gravity. the initial speed to be approximately 7.9 m/s.
Explanation:
The problem describes a case of projectile motion, a common topic in physics. Since the ball is thrown horizontally, the initial vertical velocity of the ball is zero. We're given that the horizontal distance covered is 24.0 m and the vertical distance is 45.0 m.
Because the horizontal and vertical motions are independent, we can use the equations of motion to solve the problem. First, we have to find the time it takes for the ball to hit the ground. Using the equation of motion
"y = 0.5*g*t²",
where y = 45 m is the vertical distance, g = 9.8 m/s² is the acceleration due to gravity, and t is the time in seconds. Solving for t gives us the square root of (2*y/g), which is approximately 3.03 seconds.
Second, we use this time to find the initial speed of the ball. The horizontal distance covered x = 24.0 m is equal to the product of the time it's been travelling and its initial horizontal speed (v = x/t). Using the time from the previous step, we can find the initial speed to be approximately 7.9 m/s.
Learn more about Projectile Motion here:
#SPJ2
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B. Divide the time the object travels by the distance it travels.
C. Calculate the distance the object travels and divide that by the time it takes to get there.
D. Calculate the velocity of an object and divide that by the time the object is in motion.
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A. Divide the change in the objects velocity by the time it takes to make that change.
Explanation:
Acceleration is a vector quantity whose magnitude is given by the following equation:
where
is the change in velocity of the object
is the time it took to make the change in velocity
Therefore, we see that this equation corresponds to choice A.
volume of the unknown liquid is 125mL. Is the liquid pure water? Explain your answer.
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So in order calculate the density of the unknown liquid, we need to know
its mass and its volume.
If the mass of the beaker is 165 grams empty and 309 grams with
something in it, then the mass of the stuff in it must be
(309 - 165) = 144 grams.
The question tells us that its volume is 125 mL (same as 125 cm³),
so we have everything we need.
Density = mass/volume = 144/125 = 1.152 grams per cm³ .
The density of pure water is 1.000 gram per cm³ , so the unknown liquid
is definitely not pure water.
The density of this unknown liquid is 15.2% more than that of pure water.
Even if water had a huge amount of pollution and junk in it, its density
would probably not be that much greater than 1.000 . So the unknown
liquid is probably not polluted water either.
Mass of the liquid = total mass of beaker and liquid inside the beaker -
mass of empty beaker
= 309 grams - 165 grams
= 144 grams
volume of unknown liquid = 125 ml given
Density = mass / volume = 144 / 125 = 1.152 gm / ml