A speeding bullet with a speed of 582 m/s has a kinetic energy of 34,000 J. What is its mass?

A. 0.255 Kg
B. 0.505 Kg
C. 1.05 Kg
D. 2.01 Kg
E. 0.201 Kg

0.201kg

Explanation:

The formular for calculating kinetic energy is:

Ke= 1/2 × mv2

The values given are:

Ke= 34000J

V= 582m/s

m= ?

34000= 1/2 × m × 582 × 582

34000= 1/2 ×m × 338724

34000= 169362m

To find m, divide both sides by the coefficient of m which is 169362

34000/169362= 169362m/169362

m= 0.201kg.

Thus, the mass is 0.201kg.

2b2t

explanation:

2b2t

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.