Física preguntas y respuestas

In what direction does heat transfer occur?

Sound intensity varies inversely as the square of the distance from the sound source. If you are in a movie theater and you change your seat to one that is twice as far from the speakers, how does the new sound intensity compare with that of your original seat? The sound intensity is \( \square \) of what it was originally. (Type an integer or a fraction.)

Radiation machines used to treat tumors produce an intensity of radiation that varies inversely as the square of the distance from the machine. At 3 meters, the radiation intensity is 62.5 milliroentgens per hour. What is the intensity at a distance of 1.9 meters? The intensity is tenth as needed.)

A body of 30 Newtons weight was placed on a rough inclined plane inclined to the horizontal at an angle of measure \( \theta \). A force of magnitude \( 20 \sqrt{3} \) Newtons. It was applied to it in the direction of the line of the greatest slope of the plane upward, so the body was about to move upwards. Find the measure of the angle \( \theta \) if it is known that the coefficient of static friction between the body and the plane is \( \frac{\sqrt{3}}{3} \).

83 Una pallina viene lanciata verticalmente verso l'alto con una fionda che le imprime una velocità pari a \( 15,0 \mathrm{~m} / \mathrm{s} \). Trova la velocità che ha la pallina quando raggiunge l'altezza di \( 10,0 \mathrm{~m} \).

A body of weight 30 Newtons was placed on a rough inclined plane inclined to the horizontal at an angle of measure 600 . A force of magnitude 10 Newtons was applied to it in the direction of the line of the greatest slope of the plane upward, so the body was about to move downward. Find the magnitude of the force if it is known that the coefficient of static friction between the body and the plane is \( \frac{\sqrt{3}}{3} \)

A body of weight 30 Newtons was placed on a rough inclined plane inclined to the horizontal at an angle of measure \( 60^{\circ} \). A force of magnitude 10 Newtons was applied to it in the direction of the line of the greatest slope of the plane upward, so the body was about to move downward. Find the magnitude of the force if it is known that the coefficient of static friction between the body and the plane is \( \frac{\sqrt{3}}{2} \)

Selanci verso l'alto un mazzo di chiavi con una velocità di \( 10.0 \mathrm{~m} / \). quale altezza massima raggiunge?

A body of weight 400 Newton was plated on a rough inclined plane inclined to the horizontal at an angle of measure \( 30^{\circ} \). A force was applied to the body in the direction of the line of the greatest slope of the plane upward, so the body was about to move up the plane. If the coefficient of static friction between the body and the plane was \( \frac{1}{\sqrt{3}} \). Find the magnitude of the force.

(13) A body of weight 400 Newton was pla ed on a rough inclined plane inclined to the horizontal at an angle of measure \( 30^{\circ} \). A force was applied to the body in the direction of the line of the greatest slope of the plane upward, so the body was about to move up the plane. If the coefficient of static friction between the body and the plane was \( \frac{1}{\sqrt{3}} \). Find the magnitude of the force. (14) A body of weight 30 Newtons was placed on a rough inclined plane inclined to the horizontal at an angle of measure \( 60^{\circ} \). A force of magnitude 10 Newtons was applied to it in the direction of the line of the greatest slope of the plane upward, so the body was about to move downward. Find the magnitude of the force if it is known that the coefficient of static friction between the body and the plane is \( \frac{\sqrt{3}}{3} \) (15) A body of 30 Newtons weight was placed on a rough inclined plane inclined to the horizontal at an angle of measure \( \theta^{\circ} \). A force of magnitude \( 20 \sqrt{3} \) Newtons. It was applied to it in the direction of the line of the greatest slope of the plane upward, so the body was about to move upwards. Find the measure of the angle \( \theta \) if it is known that the coefficient of static friction between the body and the plane is \( \frac{\sqrt{3}}{3} \).