- An industrial refrigeration plant is rated at 800 tons of refrigeration How many kilograms of ice at 0^circ C can it make from pure water at 0^circ C over one week?
- __ (d) Zeros to the right of a decimal and to the right of a nonzero number (are or are not)significant? (25.00) __ (e) Zeros to the left of an understood decimal and to the right of a nonzero number (are or are not) significant? (1500) __ (f) Zeros to the left of a printed decimal and to the right of a nonzero number (are or are not) significant? (1500.) 7. How many significant digits are in each of the following measurements? __ (a) 83.49 __ (k) 0.005 __ (f) 40,309 __ (b) 11.00 __ (g) 6.0035 __ (1) 0.09 o __ (c) 300 __ (h) 50. __ (m) 505.05 __ (d) .006900 __ (n) 7,500 __ (i) .0000509 __ (e) 36,900 . __ (0) 0.007090 __ (i) 0.00030000 8. Write the number "five hundred" to the given number of significant digits: __ (a) 1 significant digit __ (b) 3 significant digits __ (c) 5 significant digits 9. Round each of the following to the indicated number of significant digits: __ (a) Round 0.00567 to 1 significant digit __ (b) Round 6.09450 to 2 significant digits __ (c) Round 10.0309 to 3 significant digits
- 2. What is the value of a resistor if the current through it is 15.0 mA when a voltage of 45.0 V,is applied?
- 1. 18 C of charge pass a certain point in a conductor in 2.5 s a) What is the current in the wire? b) How many electrons have passed that point in the wire in 2.5 s? a) exists =(Q)/(t)=(18C)/(2.55)=7.24
- Conservation of Mechanical Energy In the absence of friction, the total mechanical energy remains the same. Although the amount of mechanical energy is constant, mechanical energy itself can change form. ME_(1)=ME_(f) KE_(1)+PE_(1)=KE_(f)+PE_(f) Delta KE=-Delta PE 1. Starting from rest.a 25 kg child zooms down a frictionless slide with an initial height of 3 m. What is her speed at the bottom of the slide? 2. A.755 N diver drops from a board 10 m above the water's surface. a. Find the diver's speed 5 m above the water's surface. b. Find the diver's speed just before striking the water. 3. A bird is flying with a speed of 18.0m/s over water when it accidentally drops a 2.00 kg fish. Assuming the altitude of the bird is 5.40 m, and disregarding friction, a. what is vertical speed of the fish when it hits the water? 10.3m/s b. what is the speed of the fish when it hits the water? 20.7m/s
