A scientist obtains images of a particular star, which appears as four separate stars. Which phenomenon causes the star to appear this way?

O redshift
O gravitational lensing
O principle of equivalence
O gravitational time dilation ​

Scout feels ill one day before school. her mother puts a thermometer in her mouth and the temperature begins to climb to 100°f. what is happening between the cooler thermometer and scout's body? a) scout's body is applying a force to the particles in the thermometer. b) kinetic energy is being transferred from her mouth to the thermometer. c) potential energy is being lost by the thermometer and gained by scout's body. d) the potential energy stored in foods is converted to mechanical energy to raise the mercury in the thermometer.

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

Explain why electric current cannot exist if a current doesn't have a voltage source.