Inside a space-based gravitational wave observatory, two identical spherical calibration masses, each of mass 45.0 kg, are positioned with their centres separated by a distance of 35.0 cm.
What is the magnitude of the gravitational force that they exert on each other?
1.1×10−10 N1.1 \times 10^{-10}\text{ N}1.1×10−10 N
4.9×10−8 N4.9 \times 10^{-8}\text{ N}4.9×10−8 N
3.9×10−7 N3.9 \times 10^{-7}\text{ N}3.9×10−7 N
1.1×10−6 N1.1 \times 10^{-6}\text{ N}1.1×10−6 N
31 exam-style questions on OCR A A Level Physics Gravitational fields, covering Point and spherical masses, Newton's law of gravitation, Planetary motion, and Gravitational potential and energy. Each one has a worked solution and a mark scheme showing where the marks go.