Which of the following is true about the weight of an object?

It remains same for the object.

It cannot be measured accurately.

It is a force acting on the object.

It is always less than the mass of the object.

A motor does 30 kJ of work and gains 4 kJ as heatfrom the surroundings. What is the change in the internal energy of the motor?

What are the 3 sources of credible information for nutrition ane fitness

The positive end of the molecule will attract ions with what type of charge?

Which element is not represented in the star spectrum below? Hydrogen Helium Calcium Magnesium

A greyhound's velocity changes from rest to 19 m/s in 2 seconds. What is the greyhound's average acceleration? a) 2 m/s2 b) 9.5 m/s2 c) 19 m/s d) 38 m/s

Plaskett's binary system consists of two stars that revolve in a circular orbit about a center of mass midway between them. This statement implies that the masses of the two stars are equal (see figure below).

Is mercury (the planet) rocky or gaseous (meaning relating to or having the characteristics of a gas.)

What does one prolonged blast emitted by boat a using an efficient sound producing device indicate?

Feng and Isaac are riding on a merry-ground. Feng rides on a horse at the outer rim of the circular platform, twice as far from the center of the circular platform as Isaac, who rides on an inner horse.

Alice did an experiment to find the relationship between the angle at which a ray of light strikes a mirror and the angle at which the mirror reflects the light. She placed a ray box in front of a mirror.