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3 years ago

Can someone help me with this question

Physics

1 answer:

Anna71 [15]3 years ago

7 0

Answer:

Ionic- Ion

Covalent- Molecules

Explanation:

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Newton's Law of Cooling states that the rate of cooling of an object is proportional to the temperature difference between the o

Hoochie [10]

Answer:

$\frac{dy}{dt}=k(y_t-R)$

Explanation:

According to Newton’s law of cooling, the rate of loss of heat from a body and the difference in the temperature of the body and its surroundings are proportional to each other.

$\frac{dy}{dt}=k(y_t-R)$

Here, $y_t$ represents temperature at time t, R as the room temperature, t as the independent variable, y as the dependent variable.

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4 years ago

In grassland regions, rainy seasons and drought seasons determine, in part, the _____. kinds of resident organisms spread of fir

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kinds of resident organisms

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3 years ago

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500 coulombs of charge flow through a bulb for 25 seconds. Calculate the current trough the bulb.

kondaur [170]

Answer:

500÷25=20

so 20 coulombs per second

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3 years ago

A train car with mass m1 = 515 kg is moving to the right with a speed of v1 = 7.5 m/s and collides with a second train car. The

Anna [14]

Answer:

For the first situation, we first need to find the mass of the second train car.

In order to do that, we apply the conservation of the amount of movement:

$515*7.5+m2*0=(m1+m2)*4.8$

and we have as a result:

m2 = 289.6875

For the second situation, also we will apply the conservation of the amount of movement:

$515*7.5-289.6875*6 = (515+289.6875)*V$

and we have as a result:

V = 2.64 (it is moving to the right)

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3 years ago

The force of repulsion between to like charge table tennis balls is 8.2 X 10 ^-7 N if the charge on the two objects a 6.7 X10^-9

Svetllana [295]

Answer:

0.702 m

Explanation:

The magnitude of the electrostatic force between two charged objects is given by Coulomb's Law:

$F=k\frac{q_1 q_2}{r^2}$

where

k is the Coulomb's constant

q1, q2 are the two charges

r is the separation between the objects

And the force is:

- Attractive if the two charges have opposite signs (+-)

- Repulsive if the two charges have same sign (++ or --)

In this problem we have:

$F=8.2\cdot 10^{-7}N$ is the force between the two balls

$q_1 = q_2 = 6.7\cdot 10^{-9}C$ is the charge on each ball

Solving for r, we find the separation between the balls:

$r=\sqrt{\frac{kq_1 q_2}{F}}=\sqrt{\frac{(9\cdot 10^9)(6.7\cdot 10^{-9})^2}{8.2\cdot 10^{-7}}}=0.702 m$

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3 years ago

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