nethnirasha

Arrange the following ionisation potential order of N3-, N2-, N-, N ,N+

Biodiversity is responsible for ________.

providing clean air

providing valuable crops

providing healthy soil

all of the choices

A 5 kilogram object is thrown vertically upwards with an initial velocity of 25 metres per second from the top of a building 30 metres high. On the way down, the object just misses the edge of the building and strikes the ground. Use the law of conservation of energy to determine the

(a) maximum height above the ground reached by the object, and 

(b) object’s speed just before it strikes the ground. [g= 9.8m/s] 

A 7 kg box is initially at the top of a plane inclined at 20 degrees to the horizontal. The box is given a slight push to start it moving down the plane with a velocity of 3 m/s . The coefficient of kinetic friction between the box and the incline is 0.3. The box slides to the bottom of the incline, which is 8 metres long.

(a) Calculate the initial potential energy of the box. 

(b) Determine the work done by friction 

(c) Use the work-energy principle to determine the velocity of the box at the bottom of the incline. 

[g=9.8m/s]

If you have two samples of DNA, one is exposed under high temperatures of around 95 degrees Celsius and the other one is treated with exonuclease. What would happen to the DNA and what would be left after the experiment?