Changes in the way atoms are ? together occur when compounds form
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Related Questions
If a plane has an airspeed of 40 m/s and is experiencing a crosswind of 30 m/s, what is its ground speed in m/s?
FIND THE WEIGHT OF A 80 KG MAN ON THE SURFACE OF MOON? WHAT SHOULD BE HISS MASS ON THE EARTH AND ON THE MOON? (ge = 9.8 m/s2 ; gm = 1.63 m/s2)pls answer fast
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?
How long ago did the Big Bang happen?
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Answer:
The net force is zero, so the acceleration is zero
Explanation:
Newton's second law states that the acceleration of an object is proportional to the net force applied to it, according to the equation:
(1)
where
is the net force on the object
m is the mass of the object
a is its acceleration
In this problem, we have a sled acted upon two forces, . So the net force on the sled is
(2)
however, we are told that the two forces are equal in magnitude but in opposite directions, so
So, eq.(2) becomes
and so eq.(1) becomes
which means
so the acceleration of the sled is zero, and if the sled was at rest, it will not move.
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Explanation:
Frictional force is an opposing force or a drag force. It is given by :
Where
μ is the coefficient of friction
N is the normal force
We know that the product of mass and the acceleration is called the force acting on the object. This means as the speed of the object increases, its drag force increases exponentially.
When the speed of an object increases, the attraction between the particles increases. Hence, the frictional drag increases.
Due to a number of variables, friction is worse as speed gets faster. The production of heat as a result of enhanced molecularinteraction is one of the key causes.
The frequency and force of surface molecule collisions increase as an object's velocity against another object increases, producing more heat.
This rise in temperature increases the stickiness or adhesion between the surfaces, which makes moving objects more difficult. Higher speeds can result in more pronounced relative movement of surface imperfections and microstructures, increasing interlocking and frictional forces.
Thus, as speed increases, friction increases due to a mixture of increased heat generation, adhesion, and interlocking effects.
For more details regarding friction, visit:
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Some reasons why babies cry: The baby is not feeling well, strange feeling that needs nappy change, a feeling of hot or cold, a feeling of tired and needs rest, a feeling of cuddling, feel like crying, and a feeling of hungry.
Crying is a signal of distress to babies.
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Answer:
2.5 m/s
0 m/s
Explanation:
Average speed is distance over time.
Average velocity is displacement over time.
The bicycle travels 150 meters from A to B, then 150 meters from B to A. So the distance is 300 meters and the displacement is 0 m.
s = 300 m / 120 s = 2.5 m/s
v = 0 m / 120 s = 0 m/s
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11) If Galileo had dropped a 5.0 kg cannon ball to the ground from a height of 12 m, the change in PE of the cannon ball would have been product of mass(m),acceleration(g)and height(h)
The change in PE =mgh=5*9.8*12=588 J
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12.) The 2000 Belmont Stakes winner, Commendable, ran the horse race at an average speed = v = 15.98 m/s.
Commendable and jockey Pat Day had a combined mass =M= 550.0 kg,
Their KE as they crossed the line=(1/2)Mv^2
Their KE as they crossed the line=0.5*550*(15.98)^2
Their KE as they crossed the line is 70224.11 J
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13)Brittany is changing the tire of her car on a steep hill of height =H= 20.0 m
She trips and drops the spare tire of mass = m = 10.0 kg,
The tire rolls down the hill with an intial speed = u = 2.00 m/s.
The height of top of the next hill = h = 5.00 m
Initial total mechanical energy =PE+KE=mgH+(1/2)mu^2
Initial total mechanical energy =mgH+(1/2)mu^2
Suppose the final speed at the top of second hill is v
Final total mechanical energy =PE+KE=mgh+(1/2)mv^2
As mechanical energy is conserved,
Final total mechanical energy =Initial total mechanical energy
mgh+(1/2)mv^2=mgH+(1/2)mu^2
v = sq rt [u^2+2g(H-h)]
v = sq rt [4+2*9.8(20-5)]
v = sq rt 298
v =17.2627 m/s
The speed of the tire at the top of the next hill is 17.2627 m/s
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14.) A Mexican jumping bean jumps with the aid of a small worm that lives inside the bean.
a.)The mass of bean = m = 2.0 g
Height up to which the been jumps = h = 1.0 cm from hand
Potential energy gained in reaching its highest point= mgh=1.96*10^-4 J or 1960 erg
b.) The speed as the bean lands back in the palm of your hand =v=sq rt2gh =sqrt 0.196 =0.4427 m/s or 44.27 cm/s
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15.) A 500.-kg horse is standing at the top of a muddy hill on a rainy day. The hill is 100.0 m long with a vertical drop of 30.0 m. The pig slips and begins to slide down the hill.
The pig's speed a the bottom of the hill = sq rt 2gh = sq rt 2*9.8*30 =sq rt 588 =24.249 m/s
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16.) While on the moon, the Apollo astronauts Neil Armstrong jumped up with an intitial speed 'u'of 1.51 m/s to a height 'h' of 0.700 m,
The gravitational acceleration he experienced = u^2/2h = 2.2801 /(2*0.7) = 1.629 m/s^2
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EDIT
1.) A train is accelerating at a rate = a = 2.0 km/hr/s.
Acceleration
Initial velocity = u = 20 km/hr,
Velocity after 30 seconds = v = u + at
Velocity after 30 seconds = v = 20 km/hr + 2 (km/hr/s)*30s =
Velocity after 30 seconds = v = 20 km/hr + 60 km/hr = 80 km/ hr
Velocity after 30 seconds = v = 80 km/hr=22.22 m/s
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2.) A runner achieves a velocity of 11.1 m/s 9 s after he begins.
His acceleration = a =11.1/9=1.233 m/s^2
Distance he covered = s = (1/2)at^2=49.95 m
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in any collision, momentum is transferred from one object to another and momentum is conserved