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1) which kind of bond is present in a substance that conducts electricity only when it is melted or when it is dissolved in water?
a. van der waals forces
b. metallic
c. polar covalent
d. ionic
2) Which element has luster, is ductile, and is malleable at room temperature?
a. bromine
b. palladium
c. sulfur
d. xenon
3) which chloride compound shows the greatest covalent bond character?
a. AlCl3
b. LiCl
c. MgCl2
d. SCl2
4) What is the number of molecules in 4.4 g of carbon dioxide, CO2?
a. 6x10^24
b. 6x10^23
c. 6x10^22
d. 1x10^22
A rock is thrown horizontally with a speed of 19 m/s from a vertical cliff of height 34 m. How far will it land from the base of the cliff
A man at point A directs his rowboat due north toward point B, straight across a river of width 100 m. The river current is due east. What is the speed of the river
At a temperature of 0° C, the mass and volume of a fluid are 798 kg and 1.25 m3. The coefficient of volume expansion is 1.25 10-3(° C)?1. What is the density of the fluid when the temperature has risen to 21.0° C
The atmospheric density at an altitude of 2500 km is about 1 molecule/cm3. find the mean free path predicted by the equation below
A helicopter is ascending vertically with the speed of 8 m/s. At a height of 65m above the Earth, a package is dropped from a window.
Two parallel inducting wires each carry a current of 50A. Theforce per unit length between these wires is equal to the force ofthe gravitational pull on wire 1m long. calculate the distance d between the two parallel wires
Two 2.0 cm x 2.0 cm square electrodes, spaced 0.4 mm apart, are connected to a 10 V battery. What is the charge on each electrode
A current of 15 A flows through an electric heater operating on 120 V. What is the heater's resistance? Compute the power consumption of the electric heater in kW? How much energy does it use in 600 min(10hrs)?
What is sign and magnitude of charge
A motorist drives south at 28.0 m/s for 3.00 min, then turns west and travels at 25.0 m/s for 2.00 min, find the total vector displacement
A camera lens used for taking close-up photographs has a focal length of 21.5 mm. The farthest it can be placed from the film is 30.0mm. What is the closest object that can be photographed
The magnetic field of the earth at a certain location is directed vertically downward and has a magnitude of 50.0 µT. A proton is moving horizontally toward the west in this field by a speed of 5.70*106 m/s. What is the direction and magnitude of the..
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