In introductory physics laboratories, a typical cavendish balance for measuring the gravitational constant g uses lead spheres with masses of 1.60 kg and 16.0 g whose centers are separated by about 4.00 cm. calculate the gravitational force between these spheres, treating each as a particle located at the center of the sphere.

Explanation:

= Gravitational constant = 6.67 x 10⁻¹¹

 = Gravitational force between these spheres

= mass of first sphere = 1.60 kg

 = mass of second sphere = 16 g = 0.016 kg

 = distance between the centers of the sphere = 4 cm = 0.04 m

Gravitational force between these spheres is given as

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27