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Ksju [112]
3 years ago
7

If in 30 mins Alex runs to a store that is 4 km away, what is her average speed in km/h

Physics
1 answer:
masha68 [24]3 years ago
6 0
15 km 30 divided by 4 is 7.5 km in 30 min times that by 2 the answer is 15
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A gas sample occupies 4.2 L at a pressure of 101 kPa. What volume will it occupy if the pressure is increased to 235 kPa?
Dmitrij [34]
For this we want to use Boyle's Law. Boyle’s law states that the pressure and volume of a fixed quantity of a gas are inversely proportional under constant temperature conditions. The formula for this is P1V1 = P2V2. We want to solve this out so it equals V2 (Volume 2). So P1V1 / P2 = V2. Then plug in your values for the variables. So (101)(4.2) / 235 = V2; so 424.2 / 235 = V2. The final volume equals 1.81. I hope this helps, If not I am very sorry.
7 0
3 years ago
Read 2 more answers
A bullet is dropped into a river from a very high bridge. At the same time, another bullet is fired from a gun straight down tow
anastassius [24]

Answer:

Option (c)

Explanation:

Both the bullets have same acceleration because they both falls under the influence of acceleration due to gravity.

The bullet which is fired from the gun has some initial velocity but the bullet which is dropped has zero initial velocity.

the acceleration is acting on both the bullets which is equal to the acceleration due to gravity and they both in motion in the influence of gravity.

8 0
3 years ago
Suppose you have a dipole that's free to move in any way (including rotate - imagine it floating in space). And there's an objec
Setler [38]

Complete Question

The complete question shown on the first uploaded image

Answer:

a)

The force on Q due to dipole is Attractive

b)

The charge Q exerts attractive force on the dipole

c)

Yes from the above parts, force depends on the sign of charge

d)

   F = kQq[\frac{d^{2}+2rd}{r^{2}(d+r)^{2}} ]

e)

The magnitude o force decrease by a factor of 8.0 times

Explanation:

The explanation is shown on the second uploaded image

5 0
2 years ago
A straight bar magnet is initially 4 cm long, with the north pole on the right and the south pole on the left. if you cut the ma
Greeley [361]
The right half will be a new bar magnet of 2cm with north pole on the right side and south pole on teh left.
6 0
3 years ago
The acceleration of a block attached to a spring is given by a=−(0.324m/s2)cos([2.50rad/s]t) a = − ( 0.324 m / s 2 ) c o s ( [ 2
allsm [11]

Answer:

Looks like you have:

a = -.324 cos 2.5 t

In this case   ω^2 A = .324

ω = 2.5

f = ω / (2 * pi) = 2.5 / 6.28 = .40 / sec

5 0
2 years ago
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