The gravitational force of attraction on an object placed at the surface of the earth is known a weight of the object. The weight of the object is different on different planets because it depends on the gravitational constant.
The weight is defined by the Newton's second law as the product between the mass and the gravitational acceleration, that is
W = mg
And its unit in SI is Newton (N) and Lbf in American Unit.
Therefore the option D is the only correct here. 1600 kilo Newton or 1600kN.
Answer:
Explanation:
There are two hypotheses she could test:
A cat's heart rate changes while it is napping.
A cat's heart rate does not change while it is napping.
Pressure has inverse relationship with area of an object. The smaller the area is, more pressure it exerts. Increasing the sharpness of knife(decreasing its area), increases the pressure on an object i.e ability to cut increases on increasing the sharpness.
Hope this helps.
On the surface of the Earth, the acceleration due to gravity is
<em>9.8 meters/sec² </em>(rounded)
toward the center of the Earth.
Wherever we are, since that's the direction in which things fall when they're
dropped, we call the direction toward the center of the Earth by the name "<u>down</u>",
although it's a different direction in every place.
We have the relation
where denotes the velocity of a body A relative to another body B; here I use B for boat, E for Earth, and R for river.
We're given speeds
Let's assume the river flows South-to-North, so that
and let be the angle made by the boat relative to East (i.e. -90° corresponds to due South, 0° to due East, and +90° to due North), so that
Then the velocity of the boat relative to the Earth is
The crossing is 153.0 m wide, so that for some time we have
which is minimized when so the crossing takes the minimum 30.0 s when the boat is pointing due East.
It follows that
The boat's position at time is
so that after 30.0 s, the boat's final position on the other side of the river is
and the boat would have traveled a total distance of