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3 years ago

this is a multiple select question

1 answer:

6 0

When you fly through the trososphere into the stratosphere you would expect to have the temperature remain constant and the temperature would stop decreasing

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Which of the following is true about conduction? Question 2 options: It is heat transfer through direct contact It can only occu

kramer

Answer:

through direct contact

Explanation:

took the test!

3 0

3 years ago

A treatment in which an electrical current is applied to the brain is

Elza [17]

A treatment in which an electrical current is applied to the brain is;

D. Electroconvulsive therapy

<u>An electric current would be transmitted through the brain without anesthesia through this method. However, there may be side effects of possible seizures or broken bones. </u>

3 0

2 years ago

Read 2 more answers

What type of force is keeping this person from falling through the wall

Softa [21]

Answer:

Friction

Explanation:

Friction keeps things from sliding into things according to newton's laws

5 0

2 years ago

How much time will have passed by the time a sample of an isotope has decayed to 6.25% of its original mass if the half-life is

aleksandrvk [35]

Answer:

60 days.

Explanation:

Let the original mass (N₀) = 1 g

Amount remaining (N) = 6.25% of its original mass

= 6.25% × 1

= 6.25/100 × 1

= 0.0625 g

Half life (t½) = 15 days

Time (t) =?

Next, we shall determine the rate of decay. This can be obtained as follow:

Decay constant (K) = 0.693/ half life

K = 0.693 / t½

Half life (t½) = 15 days

Decay constant (K) =?

K = 0.693 / t½

K = 0.693 / 15

K = 0.0462 / day

Finally, we shall determine the time taken for the sample of the isotope to decay to 6.25% of its original mass.

This can be obtained as follow:

Original amount (N₀) = 1 g

Amount remaining (N) = 0.0625 g

Decay constant (K) = 0.0462 / day

Time (t) =?

Log (N₀/N) = Kt/2.3

Log (1/0.0625) = 0.0462 × t / 2.3

Log 16 = 0.0462 × t / 2.3

1.2041 = 0.0462 × t /2.3

Cross multiply

0.0462 × t = 1.2041 × 2.3

Divide both side by 0.0462

t = (1.2041 × 2.3)/0.0462

t = 59.9 ≈ 60 days

Therefore, the time taken for the sample of the isotope to decay to 6.25% of its original mass is 60 days

5 0

3 years ago

A 4.33 kg ball is dropped from the roof of a building 157.2 m high. While the ball is falling to Earth, a horizontal wind exerts

laiz [17]

Answer:

The ball takes 5.66 seconds to hit the ground.

Explanation:

In this problem, the horizontal wind that interferes with the ball doesn't affect the time in which the balls hit the ground.

To find this time this is the equation for kinetic energy:

$d=\frac{1}{2}gt^2$

Where d is the distance, g is the acceleration of gravity and t is the time that you have to find, you can solve this equation to find t:

$t=\sqrt{\frac{2d}{g}}$

Replace the values:

$t=\sqrt{\frac{2(157.2m)}{9.81/s}}$

t=5.66 s

3 0

3 years ago

*this is a multiple select question*

this is a multiple select question