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katen-ka-za [31]
4 years ago
11

A balloon is at a height of 81m and is ascending upwards with a velocity of 12m/s. A body of 2kg weight is dropped from it. If g

=10m/s2, the body will reach the surface of the earth in how much time?

Physics
1 answer:
kap26 [50]4 years ago
7 0
I know you are Indian by your question, HC Verma class 9 or 11 !!

if you got any problem, comment !!

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The Environmental Protection Agency has ben concerned about the levels of radon gas in homes. If a sample of gas taken from a ba
soldier1979 [14.2K]
Answer is 2.19 g of radon will remain in the sample after 4 half-lives
6 0
3 years ago
Two billiard balls of identical mass move toward each other. Assume that the collision between them is perfectly elastic. If the
anzhelika [568]

Answer:

-20.0 m/s and 30.0 m/s

Explanation:

Momentum is conserved:

m (30.0) + m (-20.0) = m v₁ + m v₂

30.0 − 20.0 = v₁ + v₂

10.0 = v₁ + v₂

Since the collision is perfectly elastic, energy is also conserved.  Since there's no rotational energy or work done by friction, the initial kinetic energy equals the final kinetic energy.

½ m (30.0)² + ½ m (-20.0)² = ½ mv₁² + ½ mv₂²

(30.0)² + (-20.0)² = v₁² + v₂²

1300 = v₁² + v₂²

We now have two equations and two variables.  Solve the system of equations using substitution:

1300 = v₁² + (10 − v₁)²

1300 = v₁² + 100 − 20v₁ + v₁²

0 = 2v₁² − 20v₁ − 1200

0 = v₁² − 10v₁ − 600

0 = (v₁ + 20) (v₁ − 30)

v₁ = -20, 30

If v₁ = -20, v₂ = 30.

If v₁ = 30, v₂ = -20.

So either way, the final velocities are -20.0 m/s and 30.0 m/s.

3 0
3 years ago
Read 2 more answers
Please help correct answering get 20 points (physical science btw )
Zinaida [17]

Answer:

Acceleration = 3.67 m/s²

Explanation:

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.

Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.

Mathematically, acceleration is given by the equation;

Acceleration (a) = \frac{final \; velocity  -  initial \; velocity}{time}

Given the following data;

Initial velocity, u = 5 m/s

Final velocity, v = 27

Time, t = 6

To find the acceleration;

Acceleration = (v - u)/t

Acceleration = (27 - 5)/6

Acceleration = 22/6

Acceleration = 3.67 m/s²

6 0
3 years ago
Which word describes the amount of matter an object contains?
notka56 [123]

Answer: Mass is the correct answer. Explanation: As mass is defined as the amount of matter contained in the substances or an object.

8 0
3 years ago
How has the use of computer and advance in technology changed healthcare industry
aev [14]
Yes because we often used it and takes long time to spent and forgot to eat on time.
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3 years ago
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