Question

1 . A 100 kg person has a body temperature of 37°C. Hypothermia occurs at 35°C . He loses heat at a rate of 300 W to his surroundings for two hours . Use a specific heat of 3.500 j kg-1 k-1 for the humans tissue . If the metabolic for an activity is 280 W . Find the change in temperature for this activity.

a) 6.9 °C

b) 1.7 °C

c) 0.04 °C

d) 5.4 °C

2. Jack is playing a musical instrument , wile Jill is walking away from him hill's . Jill's observed frequency will .

a) increase

b) decrees

c) remain the same

3 A silver chain is weight in water . You now decide to wight the silver chain in air . What happens ?

a ) it weights less

b) It weights more

c) it weights the same .

4. Jack is playing a musical instrument , while Jill is walking away from him . Jill's observed frequency will

a) increase

b) decrease

c) remain the same

5 . At a density of 1.05 g/cm3 , the mass of 2.5 L of blood will be. . Use 1L =1.000cm3

a) 100 g

b) 5 kg

c) 2 g

d) 2.6 kg

6.A hot cup of tea has a mass of 60g with a temperature of 95°C . A person decides to pour 10 g of could water at 10°C . Determine the equilibrium temperature.

a) 52.5°C

b) 82.9°C

c) 10 °C

d) 90 °C

7 . The units for Pa in standard units are in

a) kg m2 /s3

b) kg m-1 s-2

c) kg m2/s2

d) kg m/s2

Answer 1