A stone is thrown straight up from the roof of an 80 ft building. the height, in feet, of the stone at any time t, in seconds, measured from the ground is given by ℎ(????) = −16???? 2 + 64???? + 80. what is the maximum height the stone reaches?
Answers
Answer:
144 ft
Explanation:
h(t) = -16t² + 64t + 80
The maximum height is at the vertex. We can find the vertex of a parabola using -b / (2a):
t = -64 / (2×-16)
t = 2
The vertex is at 2 seconds. The height of the stone at this time is:
h(2) = -16(2)² + 64(2) + 80
h(2) = 144
The maximum height is 144 feet.
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By adding salt to the ice-creams, it lowers its melting point and allows the ice cream to freeze cohesively. When salt is added to ice, the equilibrium is reached and kept at lower temperature.
How salt lowers the freezing point of ice?
When water reaches 32°F ( 0°C ), It turns into ice. At this temperature, The water molecules and ice molecules are interacting. If the temperature increases, more water become ice.
When the ionic compound salt is added, it lowers the freezing point of water. This concept is called "Freezing point depression". Freezing point depression is a drop in the minimum temperature at which substance freezes, caused when a smaller amount of another, non-volatile substance.
When salt added to the ice, the freezing point reduces from zero to negative value of degree Celsius -9°C( 15°F ), The temperature of salt is too cold for the salt to dissolve into the ice.
Learn more about Freezing point :
#SPJ3
Answer:
Water normally freezes at 0°C (32°F). Salt lowers the freezing temperature. (That is, it can remain a liquid at much lower temperatures.)
When sprinkled on ice, the salt lowers the freezing temperature of the water which effectively melts the ice when the salt dissolves into it. There is a limit to how low it can reduce the temperature, though. If the temperature drops below -9°C (15°F), it's too cold for the salt to dissolve into the ice.
When making ice cream, the salt lowers the temperature of the ice and water sufficiently enough to freeze the cream.
Answers
Answer:
0.324 T
Explanation:
Parameters given:
Number of turns, N = 1850
Resistance, R = 30Ω
Area of each turn, A =
Charge in the circuit, q =
The induced EMF in the coil is given as:
EMF is also given in terms of current, I, and resistance, R, as:
V = IR =
=>
Charge, q, is the product of current and time. Hence:
It = q
=>
Hence, magnetic field, B, will be:
The magnitude of magnetic field, |B| will be |-0.324| = 0.324 T
Answers
KE = 1/2 (0.03) x (5 x 5) = 0.375 kilogram-meter squared / second squared = 0.375 Joule.
Answers
For this case, the first thing you should do is take into account the definition of normal force.
By definition, we have:
- The normal force is that which is exerted on an object that is perpendicular to the surface.
If we define the coordinate system as:
- Horizontal axis points to the right
- Vertical axis points up
Then An object resting on a wall can have normal force in a horizontal direction.
Answer:
The normal force is perpendicular to the surface. The direction can be horizontal. Example: an object on a wall.
B. Germany
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Answers
Answers
Answer:
14,400 meters
Explanation:
yes