Física preguntas y respuestas

1.¿Que masa tiene un barra de cobre de \( 40 \mathrm{~cm}^{3} \) ?

\( 5 ft / s \times 0.785 \times ( 8 / 12 ) ^ { 2 } = Vel \)

1. A body is projected vertically upwards (against gravity). Its displacement (s) in metres during a time ( \( t \) ) in seconds is given by \( s=32 t-5 t^{2} \). Calcnlate (a) the dispiacement after 2 s . (b) the velocity aiter 2 s . (c) the acceleration after \( 0,5 \mathrm{~s} \). (d) the time taken to reach a maximum height. (e) the maximum height. (D) the displacement after 4 s . (g) the distance after 4 s .

1. A body is projected vertically upwards (against gravity). Its displacement ( \( s \) ) in metres during a time ( \( t \) ) in seconds is given by \( s=32 t-5 t^{2} \). Calcnlate (a) the dispiacement after 2 s . (b) the velocity atter 2 s . (c) the acceleration after \( 0,5 \mathrm{~s} \). (d) the time taken to reach a maximum height. (e) the maximum height. () the displacement after 4 s . (g) the distance after 4 s .

Converting 109° Fahrenheit to Celsius

7. A ball is thrown upward from the roof of a building 60 m tall. The ball reaches a height of 80 m above the ground after 2 s and hits the ground 6 s after being thrown. a) Sketch a graph that shows the height of the ball as a function of time. b) State the domain and range of the function. c) Determine an equation for the function.

7. A ball is thrown upward from the roof of a building 60 m tall. The ball reaches a height of 80 m above the ground after 2 s and hits the ground 6 s after being thrown. a) Sketch a graph that shows the height of the ball as a function of time. b) State the domain and range of the function. c) Determine an equation for the function.

Un objeto de 27 Kg frena repentinamente de \( 17 \mathrm{~m} / \mathrm{s} \) a \( 4 \mathrm{~m} / \mathrm{s} \) en 3 s . Calcula la fuerza que perdió durante el frenado.

Un objeto en caída libre desarrolla una fuerza de 36365 N al chocar contra el suelo. Calcula su masa.

\[ Q_{3}=-3 x 10^{-8} \mathrm{C} \] suelva según el (M.R.U), (M.R.U.A), (M.R.V.A) \( >\begin{array}{l}\text { Un vehículo que marcha a una velocidad de } 45 \mathrm{~m} / \mathrm{s} \text { aumenta su velocidad a razón de } \\ 1 \mathrm{~m} / \mathrm{s} \text { cada segundo. a) Calcular la distancia recorrida en } 6 \mathrm{~s} \text {. b) } \mathrm{Si} \text { disminuye su } \\ \text { velocidad a razón de } 1 \mathrm{~m} / \mathrm{s} \text { cada segundo, calcula el tiempo que tardará en detenerse. }\end{array} \) \( >\begin{array}{l}\text { Un móvil ubicado } 30 \text { metros a la derecha de un punto de referencia se mueve con una } \\ \text { velocidad constante de } 10 \mathrm{~m} / \mathrm{s} \text { hacia la izquierda. Calcule la posición del cuerpo a los } \\ 15 \text { segundos. }\end{array} \) \( >\begin{array}{l}\text { Un ciclista necesita } \\ \text { obtenida. b) La distancia recorrida. c)La velocidad a los } 6 \text { seg de comenzar a moverse. }\end{array} \)