Answer:
If the cart is pushed with twice the net force while its mass increases by four, its acceleration would be half the other acceleration.
Explanation:
Newton's second law relates the force (F) applied to an object with its acceleration (a) in the next way:
(1), with m the mass of the object (the cart in our case)
Note that the acceleration is directly proportional to the force applied and inversely proportional to the mass of the object, that means if we let m constant and increase the force the acceleration will increase too, and if we let F constant and increase m the acceleration will decrease, but if we increase the two quantities at the same time, we should analyze mathematically the situation to observe better the behavior of the acceleration. If 
and 
the acceleration by Newton’s second law is now:
Note that 
so the acceleration would be half the initial acceleration
Answer:
The geocentric model of Ptolemy in which the sun and other planets were believed to move round the Earth.
Explanation:
The Copernicus heliocentric model of the solar system was put forward by Nicolaus Copernicus and was published in 1543. The model proposed by Copernicus puts the Sun near the center of the Universe, motionless, with Earth and the other planets orbiting around the sun in circular paths, modified by epicycles, and at uniform speed. This is contrary to Ptolemy's geocentric solar system that puts the Earth at the center of the solar system, in which the sun and other planets were believed to move round the Earth.
Answer:
c)
Explanation:
When a ball is tossed upward, it rises due to the initial velocity which points upward (so it is positive if we choose the upward direction as positive), but once released, the only force (neglecting air resistance) acting on the ball is gravity.
This force is due to the mass of the Earth, and produces an acceleration in the same direction than the force, which is always downward, so in this case is negative.
As it has opposite direction to the velocity, causes the ball to slow down until it reach to a point when momentarily comes to an stop, and then changes direction falling with negative velocity, so it speeds up as it has the same sign than acceleration, that it is always present.
Answer:
c) heat
Explanation:
steam has more heat energy than boiling water due to its latent heat of vaporisation.
+14-17+16-28 = -17+16-14 = -1-14=-15 ... west, and out of breath
