1. What is ductile fracture? What is brittle fracture? (10 pts) 8. Please describe the differences between ductile fracture and brittle fracture. (10 pts)

A stone is dropped from the roof of a building, 1.10s after that a second stone is thrown straight down with an initial speed of 20.0 m/s & the two stones land at the same time

How high is the building h=???m

What is the direction of the magnetic field of a straight, current-carrying wire?

A mass spectrometer is being used to separate common oxygen-16 from the much rarer oxygen-18, taken from a sample of old glacial ice. (The relative abundance of these oxygen isotopes is related to climatic temperature at the time the ice was deposited.) The ratio of the masses of these two ions is 16 to 18, the mass of oxygen-16 is 2.66 × 10-26 kg, and they are both singly charged and travel at 4.9 × 106 m/s in a 1.45 T magnetic field.

What is the separation between their paths in meters when they hit a target after traversing a semicircle?

Δd =

consider the neon atom in all possible n+1, l-1 excited states that relax down to the ground state and emit light in the process. (a) Write the atomic term symbol for each of these states including the ground state (hint, use the Clebsch-Gordon series, there should be 8 total term symbols). Show your work in how you arrive at these term symbols. (b) Draw an energy level diagram showing decay of these states to the ground state by listing them in the proper order of there energies and indicate which states are allowed transitions by using an arrow to show the decay of energy from one state to the next. This is a qualitative exercise, no need to look up the values or draw the energy levels accurately - just the proper order of energy will suffice.

Suppose the length of a clock's pendulum is changed by 1.000%, exactly at noon one day. What time will it read 24 hours later, assuming it kept perfect time before the change? Note that there are two answers, and report your answers to the nearest second. Be sure to keep track of extra sig figs.

a)An object of mass ?m rests on a horizontal frictionless surface. A constant horizontal force of magnitude ?F is applied to the object. This force produces an acceleration:

• always
• only if ?F is larger than the weight of the object
• only while the object suddenly changes from rest to motion
• only if ?F is increasing

choice A

b)Now let there be friction between the surface and the object. If the object has a mass of 10 kg, and ??μs = 0.4, and ??=0.3μk=0.3, how much force would be required to cause the object to move?

c)If this force is then applied continuously, how far will the object be displaced after 4.8 seconds?

d)How fast will it be going after pulling with the same force above for 4.8 seconds?

What would be the acceleration voltage that we have to apply in the e/m ratio apparatus, when the current in the Helmholtz coils is equal to 2 amp, to achieve a radius of 5 cm of the circle of the electron path? Turns per Coil, N=132. Coil Radius, a=147.5mm.

Reference : Physics for Scientist and Engineers Chapter 21.

Two point charges q1 = 2 C and q2 = - 5 C are located in the (x,y) plane at coordinates (2,0) m and (-3,0) m respectively. Find:

a) The electric field created for both charges at points (0,0), (5,0) and (0,2)

b) the electric force on a point charge of -2.00 C placed at points (0,0), (5,0) and (0,2)

Have you ever ridden a free-fall ride at an amusement park, where the riders are suspended at a terrifying height and then plummet towards the ground in free fall? These rides use a Lenz’s law mechanism to slow the drop. Explain how Lenz’s law applies to this situation and why this mechanism is ideal for such an application.

Show that energy is conserved in a simple charging RC circuit. That is show that the total work done by the battery equals the final energy stored in the capacitor plus the energy dissipated in the resistor.

Proposition.

You and your friends are learning to play hockey, and you decide to use physics to get better by analyzing your movements. You are skating directly towards your friend at (5.98, 0) M/S who is also skating directly towards you to get the puck at a constant velocity of (-2.7, 0) M/S, and both of you reach the puck at the same time, so you collide and stick together. At the same time your hockey helmet with a mass of 5 kg goes flying away with a velocity of (0, 2.68) m/s. You have a mass of 74 Kg, your friend has a mass of 68 kg.

The questions:

1) In vector form, what is you and your friends velocity after you collide?

2) after the collision the puck is not moving on the ice and another player hits the puck towards the goal. If the average hockey player can apply a force of 80N over a 0.1s time and the goal is 15m away then provide evidence of whether or not the puck will reach the goal. the frictional force a puck experiences is 10N and the mass of a puck is .25kg. Consider friction in this case since the puck is made of a rough material.

Please show all work and explain why you are using the equations you are using !! Thank you so much. My physics teacher doesn't teach at all.

You have a wire of length L = 1.7 m for making a square coil of a dc motor. The current in the coil is I = 0.8 A, and the magnetic field of the motor has a magnitude of B = 0.31 T. Find the maximum torque exerted on the coil when the wire is used to make (a) a single-turn square coil and (b) a two-turn square coil.

Electrons are initially traveling at 2.40×106 m/s in the horizontal direction. They enter a region between two charged plates of length 2.00 cm and experience an acceleration of 4.00×1014 m/s2 vertically upward. Find: (a) the vertical position as they leave the region between the plates; (b) the angle at which they emerge from between the plates

A nozzle with a radius of 0.16 cm is attached to a garden hose with a radius of 0.88 cm that is pointed straight up. The flow rate through hose and nozzle is 0.35 L/s.
Part (a) Calculate the maximum height to which water could be squirted with the hose if it emerges from the nozzle in m.

Part (b) Calculate the maximum height (in cm) to which water could be squirted with the hose if it emerges with the nozzle removed, assuming the same flow rate.