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3 years ago

Why do you think glass bottles keep water cold longer?

1 answer:

5 0

Because glass is not a good heat conductor. What it means is that heat isn't transfered through its structure as quickly as it would with metal, for instance. Because heat can't penetrate glass as quickly, the contents stay at the same temperature for longer.

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Identify indicators of a chemical reaction. Check all of the boxes that apply.

Misha Larkins [42]

Answer: 1,2,4

Explanation:

6 0

3 years ago

A force of 100 N acts upward. Resolve this force into 2 components; one that acts 30º north of west and one that acts 60º north

GrogVix [38]

To resolve these forces we have to make use of the sines and cosines.

To resolve this force in 30 degree north of west, the answer will be

100*sin(30)

The answer will be 50N

Now to resolve the force acting 60 degree north of east

100* cos(60)

The answer will be 50N.

This also adds to the total force acting that is 50+50=100N. This is the way forces are resolved according to their specified angles.

5 0

3 years ago

Sorin hits a cricket ball straight up into the air. After 1.5\,\text{s}1.5s1, point, 5, start text, s, end text, the ball is fal

Illusion [34]

Answer:

8.2 m/s upward

Explanation:

The motion of the ball is a free fall motion, so we can use the suvat equation:

$v=u+at$

where:

v is the final velocity

u is the initial velocity

a is the acceleration

t is the time

Choosing upward as positive direction:

$v=-6.5 m/s$

$a=g=-9.8 m/s^2$ (acceleration of gravity)

t = 1.5 s

Solving for u, we find the initial velocity:

$u=v-at=-6.5-(-9.8)(1.5)=8.2 m/s$

And the direction is upward.

3 0

3 years ago

Evaluate how a reduction in the number of condensation nuclei in the tropo-

marta [7]

Answer:

i do not no sory

Explanation:

6 0

3 years ago

A sphere has a net charge of 8.11 nC, and a negatively charged rod has a charge of −6.13 nC. The sphere and the rod undergo a pr

malfutka [58]

Answer:

Charge of the sphere = $7.44 * 10^{-9} C$

Charge of the rod = $-5.46 * 10^{-9} C$

Explanation:

Parameters given:

Initial charge of sphere = 8.11 nC = $8.11 * 10^{-9} C$

Initial charge of rod = -6.13 nC = $-6.13 * 10^{-9} C$

In the process, the rod lost $4.20 * 10^{9} C$ . We have to find the charge of these electrons. Then, we subtract it from the rod's initial charge to get its final charge and add it to the sphere's initial charge to get its final charge.

Charge of $4.20 * 10^{9} C$ electrons = electronic charge * number of electrons

= $4.20 * 10^9 * (-1.6023 * 10^{-19}) C\\$

= $-6.73 * 10^{-10} C$

FINAL CHARGE OF ROD

Final charge of rod = $-6.13 * 10^{-9} C$ - ( $-6.73 * 10^{-10} C$ )

= $-5.46 * 10^{-9} C$

FINAL CHARGE OF SPHERE

Final charge of sphere = $8.11 * 10^{-9} C$ + ( $-6.73 * 10^{-10} C$ )

= $7.44 * 10^{-9} C$

4 0

3 years ago