Choose true or false for all statements

1. when the celsius temperature doubles, the fahrenheit temperature doubles.
2. when heat is added to a system, the temperature must rise.
3. in a bimetallic strip of aluminum and brass which curls when heated, the aluminum is on the inside of the curve.
4. an iron plate has a hole cut in its center. when the plate is heated, the hole gets smaller.
5.when the pendulum of a grandfather clock is heated, the clock runs more slowly.
6.cold objects do not radiate heat energy.

Explanation:

1 . When the Celsius temperature doubles, the Fahrenheit temperature doubles  - FALSE

A change of temperature from 300 F to 600 F changes celsius degree from 148 to 315 °C

2. When heat is added to a system, the temperature must rise.

- FALSE

When we add heat to a system of mixture of ice and water , temperature does not rise until whole of ice melts.

3. In a bimetallic strip of aluminum and brass which curls when heated, the aluminum is on the inside of the curve

- FALSE

Coefficient of linear thermal expansion of aluminium is more so it will be on the outer side.

4. An iron plate has a hole cut in its center. When the plate is heated, the hole gets smaller.

- FALSE

hole will be bigger. There will be photogenic expansion .

5.When the pendulum of a grandfather clock is heated, the clock runs more slowly.

TRUE

Time period is directly proportional to square root of length of pendulum.

when time period increases , clock becomes slow.

6.Cold objects do not radiate heat energy

- FALSE

Object radiates energy  at all temperature .

6 .

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2