A point charge of is at the origin, and a second
point charge of +6.00nC is on the x axis at x=0.800m Find
the magnitude and direction of the electric field at each
of the following points on the x axis

a)x=20.0cm b)x=1.20m c) -20.0cm

so, since its electric field question using e=k*q/r^2 i can solve this

so, e= (k*q/r^2) + (k*q/r^2)

so, +6.00nC is on the x axis at x=0.800m....

and -4.00nC is at the origin.. so 0.

a) e= (k*4*10^-9c / 2*10^-2m) + (k*6*10^-9c / .800m ?)   

it say its on the x axis at .800.. right?

GROUP Assignment. A block of mass m = 680 grams is attached to a spring whose spring constant k is 65 N/m. The block is pulled a distance x = 11 cm from its equilibrium position at x = 0 on a frictionless surface and released from rest at t = 0 s. (a) What are the angular frequency ω, frequency f, and period T of the resulting motion? (b) What is the amplitude A, the maximum speed v_max, and the maximum acceleration a_max of the block?

1) a 130 pound block slides up a 22.6'' en dine with coefficient of friction of 0.1 and initial velocity of 30 ft/sec. how far will the block slide up the incline before coming to rest?

a)18ft

b)29ft

c)42ft

d)57ft

2) Luio Freight cars weighing 5000 kg each roll toward each other and couple. The left car has a velocity of 1.5 m/s and the right car has a velocity of 1.2 m/s prior to impact. What is the velocity of the two cars coupled together after the impact?

a)0.013 m/s

b)0.26m/s

c)1.4 m/s

d) 16 m/s

3) A point travels in a circle according to to w=6t^2-10t . where t is in second. Determine the angular displacement between t=1s and t=3s.

a)6rad

b)10rad

c)12rad

d)15rad

A playground slide is 7.50 ft long and makes an angle of 34.0° with the horizontal. A 59.0-kg child, initially at the top, slides all the way down to the bottom of the slide.

(a) Choosing the bottom of the slide as the reference configuration, what is the system's potential energy when the child is at the top and at the bottom of the slide? What is the change in potential energy as the child slides from the top to the bottom of the slide? (Include the sign of the value in your answer.)

(b) Repeat part (a), choosing the top of the slide as the reference configuration. (Include the sign of the value in your answer.)

A series RCL circuit has a resonant frequency of 1470 Hz. When operating at a frequency other than 1470 Hz, the circuit has a capacitive reactance of 5.0 ? and an inductive reactance of 25.0 ?.

(a) What is the value of L?

(b) What is the value of C?

Me and a friend have been trying to figure this out for a while. I know I have the XL = 2*pi*f*L formula.

Any help would be appreciated (particularly if its in detailed/clear steps) so I can figure out how to do this problem that could very well be on the test.

1.A golfer hits a shot to a green that is elevated 2.80 m above the point where the ball is struck. The ball leaves the club at a speed of 19.9 m/s at an angle of 32.0˚ above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air resistance, find the speed of the ball just before it lands.

2.A 53.8-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.720 and 0.379, respectively. What horizontal pushing force is required to (a) just start the crate moving and (b) slide the crate across the dock at a constant speed?

PLZ help me with these two Questions. Thanks a lot.

A cannonball at ground level is aimed 30 degrees above the horizontal and is fired with an initial speed of 125 m/s. A) how far away from the cannon will the cannonball hit the ground? B) What is the highest point of its trajectory?

The amount of meat in prehistoric diets can be determined by measuring the ratio of the isotopes nitrogen-15 to nitrogen-14 in bone from human remains. Carnivores concentrate 15N, so this ratio tells archaeologists how much meat was consumed by ancient people. Suppose you use a velocity selector to obtain singly-ionized (missing one electron) nitrogen atoms of speed 8.95 km/s and bend them along a semicircle within a uniform magnetic field. The 14N atoms travel along a semicircle with a diameter of 27.5 cm . The measured masses of these isotopes are 2.32×10−26 kg (14N) and 2.49×10−26 kg for (15N). Find the separation of the 14N and 15N isotopes at the detector.

A football kicker can give the ball an initial speed of 25.0 m/s. What are the (a) least and (b) greatest elevation angles at which he can kick the ball to score a field goal from a point 50.0 m in front of goalposts whose horizontal bar is 3.44 m above the ground? When doing this, you may want to research some trig identities to get a formula involving only tangent functions. Also, since there are two values of angle that will work, maybe the quadratic formula is involved.

5. Suppose the Earth is really flat. Shaped like a penny, it has one side that faces the Sun at all times. Suppose this Earth is the same temperature everywhere (including the side that faces away from the Sun). Neglect any radiation losses off the rim of the Earth and assume there is no albedo or greenhouse effect. Treating it as a perfect blackbody, estimate the temperature of this new, flat Earth.

(iii) A consequence of the Free Electron approach is that the electron mass me effectively becomes a variable, the so-called effective mass, me * , which is governed by the curvature of the Ek vs. k function. Show that where the curvature of this function is large the effective mass is small. [4 marks]

(iv) It is often found that some ‘useful’ semiconductors such as silicon or gallium arsenide have bands which show a high degree of curvature, whereas many insulators do not. Discuss how this influences the properties of each type of material.

Answer it in detail (1-2 paragraphs)

1. Define a reference frame and then an inertial reference frame. Give example of both inertial and non-inertial reference frames.

2. Explain the concept of time dilation. What is the twin paradox?

3. Explain why it is impossible for an object to travel at the speed of light (Hint: evaluate the energy of the object)

4. Discuss the importance of the photoelectric effect in the context of quantum physics.

5. What is the de Broglie wavelength? List at least one experimental evidence the matter exhibits wave characteristics.

6. State Hesisenberg's uncertainty principle.

For higher accuracy, should R decade be large or small? Why?

Explain why there is more danger when you fall and bounce as opposed to falling without bouncing.