An air-filled parallel-plate capacitor has plates of area 2.40 cm^2 separated by 3.00 mm. The capacitor is connected to a(n) 23.0 V battery.

(a) Find the value of its capacitance.

pF

(b) What is the charge on the capacitor?

pC

(c) What is the magnitude of the uniform electric field between the plates?

N/C

The lens and mirror are sperated by d=1.0 m and have focal lengths of 80.0 cm and 50.0 cm, respectively. An object is placed p=1.0 m to the left of the lens as shown.

a) Locate the final image, formed by light that has gone through the lens twice

b) Determine the overall magnification of the image.

c) is the final image inverted or upright?

ANS q=160 cm M= -0.8 Inverted

1) Calculate the energy, in units of Joules and eV, and momentum, in kg*m/s and eV/c, for a photon with wavelengths of: a) 1.5 pm, b) 120 nm, and c) 21.4 cm.

Water has a mass per mole of 18.0 g/mol, and each water molecule (H2O) has 10 electrons. (a) How many electrons are there in 3.77 liters of water? (1 liter is equivalent to 1.00 × 10-3 m3) (b) What is the net charge of all these electrons?

1. Two 2.0 kg bodies, A and B, collide. The velocities before the collision are: v_A =(15iˆ-30jˆ)m/s and :v_B =(-10iˆ-5.0jˆ)m/s. After the collision, :v_fA = (-5.0iˆ - 20jˆ ) m/s. What are (a) the final velocity of B and (b) the change in the total kinetic energy (including sign)?

A 7450 kg rocket blasts off vertically from the launch pad with a constant upward acceleration of 2.25 m/s2 and feels no appreciable air resistance. When it has reached a height of 500 m , its engines suddenly fail so that the only force acting on it is now gravity.

A. What is the maximum height this rocket will reach above the launch pad?

B. How much time after engine failure will elapse before the rocket comes crashing down to the launch pad?

C. How fast will it be moving just before it crashes?

A sports car is moving at a constant velocity in the +x direction on a flat horizontal street.

1) The net force on the car is doing positive work. True or False

2) The driver presses the accelerator, the car accelerates in the same direction and, thus positive non-conservative work is being done.  True or False

3) As the car accelerates, the kinetic energy increases and the momentum decreases.  True or False

4) As the car accelerates, the potential energy decreases.  True or False

5) The driver stops pressing the accelerator and the cars coasts without friction up a ramp. Going up the ramp the total mechanical energy is constant  True or False

6) While moving up the ramp, the potential energy increases by the same amount as the kinetic energy decreases.  True or False

7) When the car started coasting, its speed was 10.0 m/s. How much higher does the car go before starting to roll backwards? (in units of meters)

8) If all other conditions were the same the car would go higher on the moon.  True or False

9) The kinetic energy of a rolling ball can decrease without a change in its speed.  True or False

10) If the kinetic energy of a rolling ball increases, the magnitude of its momentum must decrease.  True or False

electrical resistance

1. The high-resistance paper has a resistivity of 1:25 Ωm. How do your values compare? What
are possible causes for discrepancies between the known value and your calculated values?

Resistivity measurements

** thickness = .25 mm

2. What are possible causes for discrepancies between theoretical and measured values of resistors in series and in parallel?

3. When it is practical to connect resistances in series and when in parallel?

1) How well do the shapes of the equipotential curves and the electric field lines reflect the geometry of the charge distribution?

2) One of the theoretical rules of electric fields is that the equipotential curves is that the equipotential curves never cross each other, nor the fields lines. So imagine in an experiment, they cross each other. What will be the cause of that case in this experiment?

Thanks for help

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Consider the decay process E+ -> p + pi0. (a)(5 pts) What is the Q value of this reaction in MeV?(b)(5 pts) What is the energy of each particle (in MeV) if the E+ decays at rest? Use conserva-tion of energy and momentum.

A stick is resting on a concrete step with 1/7 of its length hanging over the edge. A single ladybug lands on the end of the stick hanging over the edge, and the stick begins to tip. A moment later, a second, identical ladybug lands on the other end of the stick, which results in the stick coming momentarily to rest 36.1° from the horizontal. If the mass of each bug is 2.75 times the mass of the stick and the stick is 18.7 cm long, what is the magnitude of the angular acceleration of the stick at the instant shown?(answer in rad/s^2)