Una caja de madera se desliza a velocidad constante sobre una mesa de trabajo; si la caja tiene una masa de 15Kg. y el coeficiente de fricción es de 0.2. Determina el valor de la fuerza que se le aplica a la caja de madera.

the answer is b ) square root of 5

photocells convert light energy to electricity

no. dot product   =0 when vecs at right angles

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft