A child throws a ball into the air and then catches it when it comes down. What us the effect on the ball's potential energy?A. Potential energy increases, then decreases to the original level.
B. Potential energy decreases, then increases to the original level.
C. Potential energy remains the same throughout the ball's trajectory.
D. The answer cannot be determined from the information provided.

The best example of a compression force is the force of weight on a bicycle. The answer is letter B. A compression force is when the weight of the bicycle imposes a downward force to the ground and the ground imposes an upward force to the bicycle.

I took the test and got B) the force of weight on a bicycle correct

Final answer:

La conservación de la momentum lineal dicta que la momentum total antes y después de la explosión de la granada debe ser la misma, o sea, cero. Teniendo en cuenta la dirección de cada trozo post-explosión, puedes resolver para hallar la velocidad del segundo trozo.

Explanation:

Este problema se resuelve usando las leyes de conservación de la momentum lineal, que dice que la momentum total de un sistema de partículas permanece constante siempre que no actúen fuerzas externas. En este caso, la granada explota en dos trozos, pero como la granada estaba inicialmente en reposo, la momentum total inicial sería cero. Así que, tras la explosión, la momentum total debe seguir siendo cero.

Puedes escribir la ley de conservación de la momentum para este ejemplo como sigue:

0 = momentum del trozo de 2.5 kg + momentum del trozo de 1.5 kg

Como sabemos, la momentum es el producto de la masa por la velocidad, así que para el trozo de 2.5 kg, la momentum sería 2.5 kg * 120 m/s que va a la derecha (puedes tomarlo como positiva). Luego, mujeres definir la velocidad del trozo de 1.5 kg como 'v', su momentum seria -1.5 kg * v (porque va a la izquierda, lo tomas como negativo).

Por ende,

0 = 2.5 kg * 120 m/s - 1.5 kg * v

De esta ecuación puedes resolver para 'v' y hallarás la velocidad del segundo trozo. Lo negativo indica que va a la izquierda.

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The wavelength of the wave will be 4 meters. when 5 complete waves occupy a length of 20m.

What is wavelength?

Wavelength is defined as the space between waves' crests, particularly between electromagnetic or sound wave points. A recurring event's frequency is measured by how many times it occurs in a unit of time. To underline the difference from spatial frequency, it is also occasionally referred to as temporal frequency.

There is an inverse relationship between the frequency and the wavelength of the waves as the wavelength increases the frequency decreases and if the wavelength decreases the frequency increases.

Given that a wave has 5 complete waves occupying a length of 20m. The wavelength of the wave will be calculated as below:-

λ = Distance / frequency

λ = 20 / 5

λ = 4 meters

Therefore, the wavelength of the wave will be 4 meters. when 5 complete waves occupy a length of 20m.

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All of the following are long-term risks associated with exposure to secondhand smoke EXCEPT:

A. increased risk of respiratory illness

B. increased risk of lung cancer

C. change in senses

D. increased risk of cardiovascular disease

This is the Correct Answer.