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The work function for sodium is 2.46 eV.

1. Sketch the following crystallographic directions in a cubic unit cell:
   - [0 2 1]
   - [1 0 1]

A local market sells avocados. Suppose there are 64 for sale and, unknown to you, 24 of them are rotten. If you were to purchase 4 avocados, chosen randomly from those available, let X denote the number of the purchased avocados that are rotten. What is the distribution of X? What is the probability that none of those purchased are rotten?

Show all your work 

Write the reaction between solid zinc (II) bisulfite and aqueous hydroiodic acid.

Assume ∆H = -500.0 KJ/mol zn (II) bisulfite, and the reaction occurs under constant pressure.

During this reaction a gas was produced. If 200. m3 of gas was produced at a temperature of 98.0⁰F and 1.07 atm, calculate the amount of heat (KJ) produced.

Write a word problem to match the expression step by step

x/3 = x/4 + 18

-x/4     -x/4

(x/3 - x/4) = 18

*multiply to change the denominators*

(4x/6 - 3x/6) = 18

x/6 = 18

6(x/6) = 6(18)

x = 108

Now we just halve that to get the number

108 ÷ 1/2 = 54

54 is the answer

Determine the period for the equation: 

y = 2.00sin(302t-1.0), 1.0 is in radians and 302 is in radians/sec

Round your answer to three decimal places

Express as a single sine function: y =1.82sin(wt) + 2.25cos(wt). Round your answer to three SF and type in the following format without spaces or units. y=Rsin(wt+angle) where angle is in degrees.

At an intersection of hospital hallways, a convex spherical mirror is mounted high on a wall to help people avoid collisions. The magnitude of the mirror's radius of curvature is 0.531 m.

X is a point on the line that joins the center of Earth and the Center of the moon. At X the resultant gravitational field strength of the Earth and the Moon are zero.

The following data are available: 

Mass of Earth: 6.0x10^24 kg

Mass of Moon: 7.2x10^22 kg

Radius of the Moon: 1.7x10^6 m

Distance from the center of the earth to the surface of the moon: 3.7x10^8 m

Determine the ratio Distance of X from the center of the Earth/ Distance of X from the center of the moon.

Consider the endothermic reaction:
Fe3 ( aq)+Cl- (aq )_ FeCl2+( aq)
Use Le Chatelier’s principle to predict how the equilibrium concentration of the complex ion 
 will change when: 
i) Fe(NO3 ) 3is added [2]

How much liquid is needed to prepare 663.1mL of a solution that has a new concentration of 4.8M if the stock solution is 42.3M?

Two ropes in a vertical plane exact equal magnitude forces on a hanging weight, put pulls with an angle of 86 degree between each other. what pull does each exert has If their resultant pulls is 372N directly upward? ?

A cable exerts a constant upward tension of magnitude 1.25x10^4 N and a 1.00x10^3 kg elevator as it rises through a vertical distance of 2.00 m. 
Find the work done by the tension force on the elevator. 

Hi could you pls help me with this problem

Attached is a photo of the question. I beleive that gauss's law will have to be used for the electic field portions. 

A 30 kg child slides down a playground slide at a constant speed. The slide has a height of 3.8m and is 7.8m long. using energy considerations, find the magnitude of the kinetic friction force acting on the child.</p>

A stunt man jumps from the top of a building and lands 10 meters below his initial height. In case A, the stunt man lands on a stack of foam mattresses. In case B, the stunt man lands on a stack of concrete blocks. In which case will the person be more likely to sustain serious injury?

 Lands on mattresses _____ Lands on concrete blocks _____ Same likeliness in both cases

A baseball is tossed into the air . After 0.30 second it is at the position (2.2m,2.5m).After 1.3 second it is at the position (9.6m,4.5m).Find the magnitude and direction of the displacement vector?

A mass moves back and forth in simple harmonic motion withamplitude A and period T.

(a) In terms of A, through what distance does the mass move in the time T?

(b) Through what distance does it move in the time 6.00T?

The Compton effect illustrates __________

a) the Heisenberg uncertainty principle.
b) the particle nature of light.
c) that particle waves are waves of probability.
d) the wave nature of light.
e) the ejection of photoelectrons when light strikes a metalsurface.

A 2004 Prius with a 150-lb driver and no passengers weighs 3071 lb. The car is initially at rest. Starting at t = 0, a net horizontal force Fx(t) in the +x-direction is applied to the car. The force as a function of time is given in Fig. P8.100.

(a) For the time interval t = 0 to t = 4.50 s, what is the impulse applied to the car?

(b) What is the speed of the car at t = 4.50 s?

(c) At t = 4.50 s, the 3500-N net force is replaced by a constant net braking force Bx = -5200 N. Once the braking force is first applied, how long does it take the car to stop?

(d) How much work must be done on the car by the braking force to stop the car?

(e) What distance does the car travel from the time the braking force is first applied until the car stops? 

Figure P8.100

Electromagentic Wave Theory

A boy on a 2.0 kg skateboard initially at rest tosses an 8.0 kg jug of water in the forward direction. If the jug has a speed of 3.0 m/s relative to the ground and the boy and skateboard move in the opposite direction at 0.60 m/s, find the boy’s mass.

The conditions of a gas change in a steady-flow process from 293.15 K (20°C) and 1000 kPa to 
333.15 K (60°C) and 100 kPa. Devise a reversible nonflow process (any number of steps) for 
accomplishing this change of state, and calculate U and H for the process on the basis of 1 mol of 
gas. Assume for the gas that PV/T is constant, Cv = (5/2)R, and Cp = (7/2)R

1. A woodblock of mass mw = 200 g is projected from the ground at a speed v0 = 35 m/s and at an angle θ0 = 50º. When at height h = 24 m the woodblock was hit by a bullet of mass mb = 25 g which was moving at vb = 220 m/s and at an angle θb = 70º. After the collision, the bullet embedded itself in the block and move together and land at point A on the ground. Then they
move on the ground that has a coefficient of kinetic friction µk = 0.5 and starts to compress a 
horizontal spring at point B. The distance between point A and B is 18 m and the spring constant k = 3×102 N/m. The right end of the spring is fixed, and all motions are confined in x-y plane.
(a) Was the collision between the woodblock and the bullet elastic or inelastic? 
Explain quantitively. (6 marks)
(b) Find the maximum height from the ground the block with the bullet reached. (2 marks)
(c) How far is point A from the launch point of the woodblock? (4 marks)
(d) Calculate the velocity at which the block-bullet system lands at point A. What will be the speed of it at point B?
(5 marks)
(e) Determine how much the spring will be compressed when the block-bullet system comes to a rest

1. A grate is moved 2m along a horizontal floor at a constant speed by a force of 50N which makes an angle of 30 above the horizontal. How much work is done on the grate by the force?
2. A 200g object is dragged 50cm upward with a uniform velocity along a plane inclined 30 with the horizontal by a force parallel to the incline. The coefficient of kinetic friction between the object and the plane is 0.25.

a. How much work is done by the applied force?b. What is the total work done on the object by the different forces acting on it?

Calculate the net force if there are the following forces acting on him

gravitational field strengths change. coefficient of friction stems from the..

What is the density of a solid that has a mass of 15.2 grams and a volume of 23.7 cm^3. Would this object float or sink in water?

The pulley shown in fig. 4-13 have negligible weight and friction. what is the value of Fw if the system is at equilibrium?

A penguin dives from a uniform board that is hinged at the left and attached to a spring at the right. The board has a length of 2.0mand a mass of 12kg. The spring constant is 1300/m. When the penguin dives, it leaves the board and spring oscillating with a small amplitude. Assume that the board is stiff enough not to bend and with a moment of inertia of 1/3mL^2, find the period of the oscillation.         

The question is attached 

A sign with a weight of 225 N is supported by a uniform 115 N beam as shown in the figure. Find the tension in the wire supporting the sign.
N

Find the horizontal force and the vertical force exerted by the hinge on the beam.

An airplane propeller is 2.10 m in length (from tip to tip) with mass 94.0 kg and is rotating at 2100 rpm (rev/min) about an axis through its center. You can model the propeller as a slender rod. (a) What is its rotational kinetic energy? (b) Suppose that, due to weight constraints, you had to reduce the propeller’s mass to 75.0% of its original mass, but you still needed to keep the same size and kinetic energy. What would its angular speed have to be, in rpm?

A 3200 kg boat is sailing at 11.5 km/h when the wind dies. The boat drifts for 65 meters before coming to a stop. What is the friction coefficient between the hull and the water?

Why do capacitors block DC currents?

Why do capacitors block DC currents?

The Mars revolves around the Sun. The average orbital radius is 2.279 x10^⁸ The period of Mars is 1.881 years . Using these data calculate the mass of the parent body Sun

1)As shown in the figure, a uniform conducting rod of length 0.40 m and mass 0.075 kg is in rotational equilibrium about the hinge at point O. A uniform magnetic field of 0.23 T is directed out of the plane of the page, perpendicular to the rod. Due to a battery and wires not shown, there is a current of 4.0 A in the rod directed toward point O. Determine the angle θ.

2)As shown in the figure, a conducting rod with a length of 0.79 m is placed on a horizontal frictionless surface and attached to a power supply by two springs, each with a spring constant of 81 N/m. The springs are initially at their equilibrium length and are in a region where there is a uniform magnetic field of 0.17 T that is perpendicular to the frictionless surface when the power supply supplies a current that causes the wire to move in such a direction that the two springs are stretched.

3)A conducting rod of length L = 30.5 cm slides over two horizontal metal bars with a constant speed v to the left through a distance Δx in a time Δt. The entire set up is in a region of uniform magnetic field of magnitude 1.30 T that is directed perpendicular to the rods and out ofthe page.

(a) If the induced emf has a magnitude of 1.00 V, what is the speed with which the rod moves?

 

4)An MRI technician moves his hand from a region of very low magnetic field strength into an MRI scanner's 2.00-T field with his fingers pointing in the direction of the field.

(a) Find the average emf induced in his wedding ring, given its diameter is 2.34 cm and assuming it takes 0.222 s to move it into the field.


(b) If the resistance of the ring is 1.00 mΩ, how much heat will be transferred to the ring during this time?