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A stone is thrown upward with an initial speed of 48 ft/s.
A. what will its maximum height be ?
B. where will it be after 1 s ?
A stone is dropped into a well and 4 seconds later the sound of the splash is heard. If sounds travel at a speed of 340 m/s, how deep is the well ?
The temperature rises by 20°F what is the rise in Celsius scale
14. 32. Atoms with unpaired electrons are called _________.
a. Lone pair
b. Fake atoms
c. Single atoms
d. Paramagnetic
15. 34. Short chain alkanes are prepared through ________.
a. Saponification
b. Catalytic cracking
c. Hydration
d. Oxidation
16. 38. Which of the following represents a non-polar covalent bond?
a. Hydrogen - Oxygen
b. Carbon - Carbon
c. Carbon - Nitrogen
d. Lithium - Fluorine
17. 39. The reaction of water with alkene to produce an alcohol is a/an ____ reaction.
a. Saponification
b. Combustion
c. Condensation
d. Addition
18. 40. Which one of the formulas for ionic compounds below is incorrect?
a. SrCl2
b. Al3P2
c. AlCl3
d. Cs2S
9. 19. In the ground state of a cobalt atom there are ___ unpaired electrons and the atom is ___.
a. 3, paramagnetic
b. 2, diamagnetic
c. 5, paramagnetic
d. 0, diamagnetic
10. 20. Which of the following bond is the strongest?
a. carbon – hydrogen bond
b. carbon – carbon triple bond
c. carbon – nitrogen bond
d. carbon – carbon single bond
11. 25. Saponification of fats needs a strong ________ to proceed to completion.
a. halogen
b. acid
c. catalyst
d. base
12. 28. Which of the following elements can only form one bond (alkane) in a Lewis structure?
a. Oxygen
b. Hydrogen
c. Carbon
d. Aluminum
13. 29. Which element will have 18 electrons in its Lewis dot symbol?
a. Argon
b. Carbon
c. Boron
d. Phosphorus
Two small conducting and identical spheres A and B have charges -25 nC and +15 nC, respectively. They are separated by a distance of 0.02 m. (a) What is the magnitude of the electric force between the two spheres? Is this force attractive or repulsive? (b) The spheres are then allowed to touch each other and then separated. What is the magnitude of the force between the two spheres? Is this a repulsive force or an attractive force?
The electron and proton of a hydrogen atom are separated (on the average) by a distance of approximately 5.3x10^-11 m. Find the magnitude of the electric force and the gravitational force between the two particles
Calculate the magnitude and direction of the electric field at a point P which is 30 cm to the right of a point charge Q = -3.0 x 10-6 C
You attach an object to the bottom end of
a hanging vertical spring. It hangs at rest after
extending the spring 18.3 cm. You then set
the object vibrating. Do you have enough
information to find its period? Explain your
answer and state whatever you can about its
period.
An oscillatory body of mass In attached to a spring of stiffness constant s performs simple harmonic motion in the x-direction. Show that the oscillation is described by the equation mx + sx =0
