What happens to metal when in contact with an acid?

What are the two ways in which weathering can occur

The student moves his leg 34 cm sideways as shown. The average resistance force is 23 N. (a) (i) State the relationship between work done, force and distance moved. (1) (ii) Calculate the work done when the student moves his leg sideways once.

Which new process was added to the nebular theory of solar system formation to account for the existence of Jupiter-mass planets that orbit close to their stars (the "hot Jupiters") ?

An electrical discharge between parts of clown or a cloud in the ground is called?

In which of the following situation is work being done? A car is pushed but does not budge. A weightlifter holds a barbell over his head. A wagon is pulled at an angle of 30 degrees to the horizontal. A swimmer treads water for 15 minutes.

A humanoid skeleton is found buried in the ashes of a volcano that erupted between 10,000 and 12,000 years ago. when scientists use absolute dating techniques to obtain an age of the fossil, approximately how much carbon-14 isotope will remain?

Two objects exert a gravitational force of 3 N on one another when they are 10 m apart. What would that force be if the distance between the two objects were reduced to 5 m? A. 1.5 N B. 6 N C. 12 N D. 24 N

5 potential causes of infertility

Which medium could NOT transmit a mechanical wave? A. air B. rope C. vacuum D. metal bar

Most engines will contain how many cylinders in order to maintain a proper balance of weight and forces? A. An even number B. Always six C. An odd number D. Always four