Physics Questions & Answers

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 \( \frac{\sqrt{3}}{3} \).

(11) A body of weight 60 Newtons was placed on a rough inclined plane inclined to the horizontal at an angle whose sine \( =\frac{3}{5} \). It was observed that the body is about to move under the action of its weight only. Find the coefficient of static friction between the body and the plane. (12) A body was placed on a rough inclined plane inclined to the horizontal at an angle of measure \( 60^{\circ} \). The coefficient of static friction between the body and the plane was \( \frac{\sqrt{3}}{2} \). Explain and state the reason why the body cannot remain in equilibrium on the plane. (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 magnitudc 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 \( \theta \). 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 \( \frac{\sqrt{3}}{3} \).

La Purte Sub rayadu EJERCICIO 1 ( 20 puntos): Un lote de material de construcción, se encuentre ubicado a 30 m del centro de una grúa giratoria, la cual gira con una rapidez angular constante de 0.8 rad/s, realizando 3 revoluciones. Luego, la grúa disminuye su rapidez angulara \( 0.2 \mathrm{rad} / \mathrm{s} \), recorriendo 10 metros con aceleración angular constante. Manteniendo esa aceleración, la grúa tiempo después se detiene. Determine: A) (7 puntos) La distancia total recorrida desde que la grúa comienza a moverse hasta que se detiene. B) (6 puntos) El tiempo total que duró el movimiento. C) (3 puntos) Calcule el módulo de la aceleración total dellote cuando la grúa gira con rapidez constante. D) ( 4 puntos) Calcule el módulo de la aceleración total del lote cuando la grúa desacelera, en el instante cuando \( \omega=0.2 \frac{\mathrm{rad}}{\mathrm{s}} \).