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Sciences
Top Selling Sciences Questions
Figure P12.1 shows several snapshots of a wave pulse as it travels along a string. Estimate the speed of the wave pulse. Figure P12.1 ? (m) t = 0 0.2 x (m) 10 40 50 60 70 -0.2 0.2 _t = 1 s x (m) 10...
A wave on a Slinky has a frequency of 2.3 Hz. It takes 3.5 s to travel the length of the Slinky (0.30 m). What is the wavelength?
An electron enters a bubble chamber and produces a spiral track like that shown on the left in Figure Q20.13. The magnetic field is directed into the page, and the electron had an initial velocity of...
Refer to Fig. 5.35. The vessel shown is to be used for a special experiment in which it will float in a fluid having a specific gravity of 1.16. It is required that the top surface of the vessel is...
A moving object whose initial KE is 10 J is subject to a frictional force of 2 N that acts in the opposite direction. How far will the object move before coming to a stop?
An 800-kg car coasts down a hill 40 m high with its engine off and the drivers foot pressing on the brake pedal. At the top of the hill the cars speed is 6 m/s and at the bottom it is 20 m/s. How...
Give the product(s) of each of the following reactions. (a) (b) (c) (d) (e) NH2 CH;CCI + 2
Which of the following amino acids has a polar side chain? NH2 HANCH-CH-CH,CH-CH NH2 CHHH CH CH3
A fuel distributor supplies four liquid fuels, each of which has a different ratio of ethanol to gasoline. Five percent of the demand is for E100 (pure ethanol), 15% for E85 (85.0 volume% ethanol),...
An apple weighs 60 g and has a volume of 75 cm 3 in a refrigerator at 8 C. What is the apples density? List three intensive and two extensive properties of the apple.
For the indicated physical setup in (a), (b), and (c) in Fig. P3.11, write a process equation and the expression for work. R-410a (a) (b) (c)
The standard heat of combustion of liquid n-octane to form CO 2 and liquid water at 25C and 1 atm is H c = 5471 kJ/mol. (a) Briefly explain what that means. Your explanation may take the form When...
A motorcyclist of mass 60 kg rides a bike of mass 40 kg. As she sets off from the lights, the forward force on the bike is 200 N. Assuming the resultant force on the bike remains constant, calculate...
Calculate the orbital speed of an artificial satellite travelling 200 km above the Earths surface. (The radius of Earth is 6.4 10 6 m and its mass is 6.0 102 4 kg.)
A cascade system is composed of two ideal refrigeration cycles, as shown in Fig. 9.28. The high temperature cycle uses R-410a. Saturated liquid leaves the condenser at 40C, and saturated vapor leaves...
Several years ago, management at Tuglar Corporation established a grievance committee composed of employees who volunteered to work toward the amicable resolution of disputes between Tuglar...
Harriet McNeil, proprietor of McNeils Auto Mall, believes that it is good business for her atuomobile dealership to have more customers on the lot than can be served, as she believes this creates an...
This question is about endothermic and exothermic reactions. a. Explain the meaning of the terms endothermic and exothermic. b. (i) Draw an energy level diagram for the reaction: (ii) Is this...
In an analysis of salaries paid to sales personnel in a company, it is found that those salaries have modes of $75,000 and $95,000. Does It Make Sense? For Exercises, determine whether the statement...
A MPV has seven passenger seats one in the front, and three in each of the other two rows. a. In how many ways can all 8 seats be filled from a party of 12 people, assuming that they can all drive?...
Draw dot-and-cross diagrams for the following covalently bonded molecules. Show only the outer electron shells. Note that in part d the beryllium atom is electron deficient and in part e the...
A student drops a small black sphere alongside a vertical scale marked in centimetres. A number of flash photographs of the sphere are taken at 0.10 s intervals: The first photograph is taken with...
The x 2 statistic from my study was close to zero, so I rejected the null hypothesis.
A solid uniform hemisphere, of radius r, is placed onto a rough plane inclined at 45 to the horizontal. A force, P, parallel to and up the plane, is applied to the hemisphere at a point that is r/2...
Spin Cycle Architecture uses three activity pools to apply overhead to its projects. Each activity has a cost driver used to assign the overhead costs to the projects. The activities and related...
The absorption spectrum of I 2 has E 00 /hc = 15,677 cm 1 , and the onset of the continuum is at 19,735 cm 1 . The excited state dissociates to I( 2 P 3/2 ) + I( 2 P 1/2 ), which is 7589 cm 1 above...
_______are shock pads and flex points. a. Vertebrae b. Cervical bones c. Lumbar bones d. Intervertebral disks
The _______ is responsible for a eukaryotic cells shape, internal organization, and cell movement.
A ________ is the smallest unit that can live and reproduce by itself using energy, raw materials, and DNA instructions.
The plasma membrane _______. a. Surrounds the cytoplasm b. Separates the nucleus from the cytoplasm c. Separates the cell interior from the environment d. Both a and c
A controlled experiment should have all the following features except ________ . a. A control group b. A test subject c. A variable d. Many testable predictions
_______is a type of connective tissue;_______ form(s) in it. a. An osteon; collagen b. Bone marrow; blood cells c. Bone; an osteocyte d. A sinus; bone marrow
Muscle tone is _______. a. The same as muscle tension b. A steady, low-level state of contraction c. Not present when a muscle is relaxed d. All of the above
Muscle fibers shorten when _______ slides over _______. a. Myosin, actin b. Actin, myosin c. Myoglobin, actin d. Myosin, sarcomeres
We usually measure the densities of solids and liquids at a temperature of 25 C. Express this temperature on the Fahrenheit and Kelvin scales. Strategy There are 1.8 F for every 1.0 C. The scales do...
On a hillslope with a weathering rate of 20 microns/yr and an effective hillslope diffusivity of 0.02 m 2 /yr, what is the expected curvature of the hillslope? Plot the full profile if the summit of...
Match the M words with their defining feature. muscle muscle twitch muscle tension myosin motor neuron myofibrils muscle fatigue a. actin's partner b. delivers contraction signal c. a muscle cannot...
Huey and Dunham (1987) measured the running speed of fence lizards, Sceloporus merriami, in Big Bend National Park in Texas. Individual lizards were captured and placed in a 2.3-meter raceway, where...
Given the chemical species in the atmosphere and their proportions in Table 5.1, what is the mean atomic weight of atmospheric gas, in kg/mole? Use only the three dominant species: nitrogen, oxygen,...
Consider an infinite 1D chain of equally spaced fluorine atoms. (a) Sketch the band structure of this chain. Include all four valence orbitals (2s, 2p x , 2p y , 2p z ) in the diagram and indicate...
A commonly used bedload transport formula in fluvial settings is the Meyer-Peter-Muller formula. One version of this is simply: Q=A(t b -t c ) 3/2 , where A = 0.04 (and the units of A work out such...
Write out half equations, the cell reaction, and determine the standard potential of the following cells given standard electrode potentials E(Cu+/Cu) = +0.34 V, E(Sn*/Sn) = -0.14 V, E(Co*/Co) =...
Why is there no diffusion term in the mass continuity equation? Suppose that a fluid contains a binary mixture of dry air and water vapour. Show that the change in mass of a parcel of air due to the...
Water is flowing into the top of a tank at a rate of $200 \mathrm{gpm}$. The tank is $18 \mathrm{in}$. in diameter and has a 3 in. diameter hole in the bottom, through which the water flows out. If...
Propose a plausible synthesis for the following transformation (many steps are required):
Identify the reagents that you would need to accomplish each of the following transformations. a. b. H.
5-Methylcyclopentadiene undergoes homolytic bond cleavage of a C!H bond to form a radical that exhibits five resonance structures. Determine which hydrogen is abstracted and draw all five resonance...
Calculate S for the isothermal compression of 1.75 mol of Cu(s) from 2.15 bar to 1250. bar at 298 K. = 0.492 10 4 K 1 , = 0.78 10 6 bar 1 , and the density is 8.92 g cm 3 . Repeat the calculation...
Explain why the spectator species M in Equation (25.5) is needed to make the reaction proceed.
The transition has two lines given by vÌ = 25354.8 cm 1 and vÌ = 25242.7 cm 1 . The transition has three lines given by vÌ = 32444.8 cm 1 , vÌ = 32334.0 cm 1 , and...
The disaccharide lactose can be decomposed into its constituent sugars galactose and glucose. This decomposition can be accomplished through acid-based hydrolysis, or by the enzyme lactase. Lactose...
Consider the schematic reaction a. If the reaction is one-half order with respect to [A], what is the integrated rate law expression for this reaction? b. What plot would you construct to determine...
The rigid beam is supported by the three suspender bars. Bars AB and EF are made of aluminum and bar CD is made of steel. If each bar has a cross-sectional area of 450 mm 2 , determine the maximum...
The beam is fabricated from four boards nailed together as shown. Determine the shear force each nail along the sides C and the top D must resist if the nails are uniformly spaced at s = 3 in. The...
A point on a thin plate is subjected to the two stress components. Determine the resultant state of stress represented on the element oriented as shown on the right. 60 MPa 85 MPa 45 30 85 MPa
The state of stress at a point is shown on the element. Determine (a) the principal stresses and (b) the maximum in-plane shear stress and average normal stress at the point. Specify the orientation...
The floor of a heavy storage warehouse building is made of 6-in.-thick stone concrete. If the floor is a slab having a length of 15 ft and width of 10 ft, determine the resultant force caused by the...
Classify each of the structures as statically determinate, statically indeterminate, or unstable. If indeterminate, specify the degree of indeterminacy. The supports or connections are to be assumed...
Classify each of the following trusses as stable, unstable, statically determinate, or statically indeterminate. If indeterminate state its degree. a. b. c.
Determine the force in each member of the truss and state if the members are in tension or compression. 4 kN -3 m- 3 m- 3 m- B. 3 m 5 m 5 kN
Determine the force in members JK, JN, and CD. State if the members are in tension or compression. Identify all the zero-force members. K 20 ft DE B - 20 ft- 30 ft- - 20 ft 2 k 2k
Determine the force in members GF, FC, and CD of the bridge truss. State if the members are in tension or compression. Assume all members are pin connected. 15 ft 30 ft B. - 40 ft-40 - 40 ft- 40 ft-...
Determine the force in members BG, HG, and BC of the truss and state if the members are in tension or compression. 4.5 m 3 m D 7 kN 6 kN 4 kN 12 m, 4 @ 3 m
Determine the forces in members KJ, CD, and CJ of the truss. State if the members are in tension or compression. 30 kN 20 kN 15 kN 15 kN 5 kN 10 kN 5 kN H. Ap 3 @1m = 3 m 6 @ 3 m = 18 m- %3D
Determine the forces in all the members of the lattice (complex) truss. State if the members are in tension or compression. K 12 ft 6 ft D A B 12 ft 6 ft 6 ft- 2k
Draw the shear and moment diagrams for each member of the frame. Assume the frame is pin connected at A, and C is a roller. 4 k/ft 15 k 4 ft 10 k 4 ft -10 ft
Draw the shear and moment diagrams for each member of the frame. Assume the frame is roller supported at A and pin supported at C. 1.5 k/ft B -10 ft- 6 ft 2 k 6 ft
Draw the influence line for (a) The vertical reaction at A, (b) The shear at B, and (c) The moment at B. Assume A is fixed. Solve this problem using the basic method of Sec. 61. A. 2 m
Draw the influence line for the force in member GD, then determine the maximum force (tension or compression) that can be developed in this member due to a uniform live load of 3 kN/m that acts on...
A fluid has a kinematic viscosity of 15.0 mm 2 /s at 100F. Determine its equivalent viscosity in SUS at that temperature.
Compute the time required to reduce the depth in the tank shown in Fig. 6.14 by 225 mm if the original depth is 1.38 m. The tank diameter is 1.25 m and the orifice diameter is 25 mm. dh
Oil with a specific gravity of 0.90 is flowing downward through the venturi meter shown in Fig. 6.33. If the manometer deflection h is 28 in, calculate the volume flow rate of oil. 4-in inside...
The venturi meter shown in Fig. 6.32 carries oil (sg = 0.90). The specific gravity of the gage fluid in the manometer is 1.40. Calculate the volume flow rate of oil. 75-mm inside diameter Flow 0.25 m...
Repeat Problem 6.49 for a DN 50 Schedule 80 pipe. Repeat Problem Compute the resulting velocity of flow if 400 L/min of fluid flows through a DN 50 Schedule 40 pipe.
Determine io in the circuit of Fig. 2.84. 222 51o 54 V(+
Given the circuit in Fig. 2.101 and that the resistance, R eq , looking into the circuit from the left is equal to 100 Ω, determine the value of R 1 . R ww R1 R,
Determine the energy loss when 1.50 ft 3 /s of water flows from a 6-in standard Schedule 40 pipe into a large reservoir.
Determine the required size of new Schedule 80 steel pipe to carry water at 160F with a maximum pressure drop of 10 psi per 1000 ft when the flow rate is 0.5 ft 3 /s.
An expanded beam of red light from a HeNe laser ( 0 = 632.8 nm) is incident on a screen containing two very narrow horizontal slits separated by 0.200 mm. A fringe pattern appears on a white screen...
Two light waves E x = E 0 cos (kz - t) and E y = -E 0 cos (kz - t) overlap in space. Show that the resultant is linear light and determine its amplitude and tilt angle .
Explain why a complete circuit is necessary for a nonzero current to exist.
The two long wires in Figure P20.1 carry parallel currents of equal magnitude I. Give the direction of the total magnetic field at points A, B, C, and D. A B D
Find the available NPSH when a pump draws water at 140F from a tank whose level is 4.8 ft below the pump inlet. The suction line losses are 2.2 lb-ft/lb and the atmospheric pressure is 14.7 psia.
(a) Write Verilog code for an 8-bit MISR that is similar to that shown in Figure 10-28.? (b) Design a self-test circuit, similar to that shown in Figure 10-25, for a 6116 static RAM. The write-data...
In non-aqueous solvents, it is possible to react HF to create H 2 F + . Which of these statements follows from this observation? (a) HF can act like a strong acid in non-aqueous solvents (b) HF can...
The diagram shows a pair of nutcrackers. Forces F are applied to the handles of the nutcrackers. a. The forces on the nut are bigger than F. Explain this. b. The nut does not crack. State two changes...
Convert the following perspective formulas to Fischer projections. (a) (b) (c) (d) H OH .C. CH; CH,OH
a. Draw dot-and-cross diagrams to show the formation of a co-ordinate bond between the following: i. Boron trifluoride, BF 3 , and ammonia, NH 3 , to form the compound F 3 BNH 3 ii. Phosphine, PH 3 ,...
The first law of thermodynamics states that the change U in the internal energy of a system is given by U = Q W, where Q is the heat and W is the work. Both Q and W can be positive or negative...
Some nickel(ii) sulfate solution was carefully placed in the bottom of a beaker of water. The beaker was then covered and left for several days. a. Describe what you would see after: (i) A few hours...
The diagram shows the positions of a ball as it rolled down a track. The ball took 0.5 s to roll from one position to the next. For example, it rolled from A to B in 0.5 s and from B to C in 0.5 s...
a. The diagram below shows the structures of three amino acids. i. Draw a diagram to show the structure of the tripeptide with the following sequence: alanineglycineserine. ii. What is the name given...
Listed below are the numbers on the jerseys of the starting lineup for the New Orleans Saints when they won their first Super Bowl football game. Does it make sense to compute the range and standard...
The following are the body temperatures (in F) of randomly selected normal, healthy adults: 98.6 98.6 98.0 98.0 99.0 98.4 98.4 98.4 98.4 98.6 Range and Standard Deviation. Exercises each provide a...
The heights of 500 female students, half of whom are college students while the other half are second-grade students. Describing Distributions. For each distribution described in Exercises, answer...
Some students investigated what size of quadrat they should use to assess the abundance of plant species in an old field ecosystem. They used quadrats of side 10, 25, 50, 75 and 100 cm and recorded...
A small company has four stockholders who vote on a new advertising campaign. The number of shares owned and the vote of each stockholder are given in the table below. Does the new campaign receive a...
Are the following molecules polar or non-polar? In each case give a reason for your answer. (Electronegativity values: F = 4.0, Cl = 3.0, Br = 2.8, S = 2.5, C = 2.5, H = 2.1) a. Chlorine, Cl 2 b....
If you bet $1 in Kentuckys Pick 4 lottery, you either lose $1 or gain $4999. (The winning prize is $5000, but your $1 bet is not returned, so the net gain is $4999.) The game is played by selecting a...
Heights of adult American males are normally distributed with a mean of 69.0 inches and a standard deviation of 2.8 inches. The U.S. Marine Corps requires that males have heights between 64 inches...
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