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ella [17]
3 years ago
8

The pilot of an airplane traveling 180km/h wants to drop supplies to flood victims isolated on a patch of land 160 m below. The

supplies should be dropped how many seconds before the plane is directly overhead?
Physics
1 answer:
gulaghasi [49]3 years ago
4 0
I think it's 21 that's what I got when I was on that answer
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The table below provides information about several mineral samples that were used during an investigation.
Akimi4 [234]

Answer:calcite

Explanation:

6 0
3 years ago
**100 points** PLEASE ANSWER IN 3 PARAGRAPHS
Deffense [45]

Answer:

In the previous section, we defined circular motion. The simplest case of circular motion is uniform circular motion, where an object travels a circular path at a constant speed. Note that, unlike speed, the linear velocity of an object in circular motion is constantly changing because it is always changing direction. We know from kinematics that acceleration is a change in velocity, either in magnitude or in direction or both. Therefore, an object undergoing uniform circular motion is always accelerating, even though the magnitude of its velocity is constant.

You experience this acceleration yourself every time you ride in a car while it turns a corner. If you hold the steering wheel steady during the turn and move at a constant speed, you are executing uniform circular motion. What you notice is a feeling of sliding (or being flung, depending on the speed) away from the center of the turn. This isn’t an actual force that is acting on you—it only happens because your body wants to continue moving in a straight line (as per Newton’s first law) whereas the car is turning off this straight-line path. Inside the car it appears as if you are forced away from the center of the turn. This fictitious force is known as the centrifugal force. The sharper the curve and the greater your speed, the more noticeable this effect becomes.

Figure 6.7 shows an object moving in a circular path at constant speed. The direction of the instantaneous tangential velocity is shown at two points along the path. Acceleration is in the direction of the change in velocity; in this case it points roughly toward the center of rotation. (The center of rotation is at the center of the circular path). If we imagine Δs becoming smaller and smaller, then the acceleration would point exactly toward the center of rotation, but this case is hard to draw. We call the acceleration of an object moving in uniform circular motion the centripetal acceleration ac because centripetal means center seeking.

hope it helps! stay safe and tell me if im wrong pls :D

(brainliest if you want, or if its right pls) :)

4 0
2 years ago
Why is electrostatic force able to act at a distance ​
mote1985 [20]
In Electrostatics the electrical force between Two charged objects is inversely Related to the distance of separation between the two objects .
7 0
3 years ago
Without water's hydrogen bonds, which
brilliants [131]

Answer:

A. Water would be a gas at room temperature, and

D. Ice would sink in water.

Explanation:

There are three types of intermolecular forces: London dispersion forces, dipole-dipole interactions, and hydrogen bonds. The relative strength of these forces depend on the size of the molecule. However, for small molecules like water (three atoms per molecule,) hydrogen bonds would be much stronger than the other two types of forces.

Without hydrogen bonds, water molecules would be held together only with dipole-dipole interactions and London dispersion forces. To get an idea of what that would be like, consider hydrochloric acid \rm HCl.

\rm HCl and water \rm H_2O contain about the same number of electrons. The H-Cl bond in \rm HCl is polar, which allows for dipole-dipole interactions. However, only H-O, H-F, and H-N bonds allow for hydrogen bonding. As a result, there won't be any hydrogen bonding between \rm HCl molecules. Without hydrogen bonding, \rm HCl boils at well below \rm 0\; ^\circ C under standard pressure. It is a gas at room temperature under standard pressure. That's about the same as what water molecules would behave (physically) without any hydrogen bonds between them.

Also because of hydrogen bonding, the density of ice (solid \rm H_2O) is typically greater than that of water (liquid \rm H_2O.) When compared to water in its liquid state, there are more hydrogen bondings between molecules of water in its solid state. The hydrogen bonds hold the molecules together to form a lattice. Because of this structure due to hydrogen bondings, the molecules are farther apart than they are in the liquid states. As a result, the density of ice is typically smaller than that of water. That would likely not be the case if there was no hydrogen bondings between water molecules.

6 0
3 years ago
The universal gas constant is 8.31451 J/K · mol. Calculate the change in internal energy of 7 mol of helium gas when its tempera
Helga [31]

Answer:

Change in internal energy of the gas is given as

\Delta U = 427.8 J

Explanation:

change in internal energy of the ideal gas is given as

\Delta U = \frac{f}{2}nR\Delta T

here we know that

n = 7 mol

R = 8.31451 J/K-mol

\Delta T = 4.9 k

since we know that Helium gas is a monoatomic gas so we have

f = 3

now we have

\Delta U = \frac{3}{2}(7)(8.31451)(4.9)

\Delta U = 427.8 J

4 0
3 years ago
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