certain body of volume \( 0.4 \mathrm{~m}^{3} \) has a density of \( 125 \mathrm{~kg} / \mathrm{m}^{3} \). Given that on planet \( X \) its weigh \( 2 / 5 \) of this weight on planet \( Y \) and the ratio of its weight on earth to its weight on planet \( X \) 1 , calculate: Its mass on planet \( Y \). Its weight on earth given earth's gravity \( =10 \mathrm{~m} / \mathrm{s}^{2} \) Its weight on planet \( X \) Its weight on planet \( Y \) Force of gravity on planet \( X \) and \( Y \).

\( vf=vo^{2}+2.a.d \)

3) Se sabe que la aceleración (a) se define como el cambio de la velocidad \( (v) \) en el tiempo (t), entonces \( a=\frac{d}{d t} v \), si la velocidad en cierto sistema está determinada por: \( v(t)=t^{2}-5 t \) a) ¿Cuál será el tiempo en el cual la velocidad es constante? \( v(t)=-S \)

The force needed to keep a car from skidding on a curve varies Inversely as the radius of the curve and jointly as the weight of th car's speed. Suppose that 200 pounds of force keeps a 3200 -pound car from skidding on a curve of radius 400 ft at 25 mph . What car from skidding on a curve of radius 550 ft at 55 mph ? pounds of force

The brightness of a light bulb changes inversely with resistance and directly with voltage. What is the new resistance if a 60 -watt, 120 -volt bulb is used in place of a 100 -watt, 120 -volt bulb with 144 ohms?

¿Qué describe la ley de Coulomb propuesta por el fisico francés Charles Augustin de Coulomb para el año de 1785 ?