answer all te parts _the question is . What are the different techniques used by Mass-spectroscopes for ionization and detection of the required signal. What is ICP-MS ? What are its advantages over traditional MS.

In a famous experiment done at the end of the 19th century, two metal electrodes were placed in an evacuated glass tube. A high voltage was applied between them. By using an appropriate metal for the cathode (e.g., sodium or potassium), it was found that a current could be made to flow when the cathode was illuminated with blue light, but no current would flow when red light was used, no matter how bright the light. Einstein was able to explain this strange phenomenon, and as a result, this experiment was considered the first experimental demonstration of

A. the wave nature of light.

B. the particle nature of electrons.

C. the wave nature of electrons.

D. the particle nature of light.

Two 2.3 kg bodies, A and B, collide. The velocities before the collision are v → A = ( 34 i ̂ + 29 j ̂ ) m/s and v → B = ( 19 i ̂ + 1.6 j ̂ ) m/s . After the collision, v → A ′ = ( 4.0 i ̂ + 12 j ̂ ) m/s . What are (a) the x-component and (b) the y-component of the final velocity of B? (c) What is the change in the total kinetic energy (including sign)?

Assume that in the Stern-Gerlach experiment for neutral silver atoms, the magnetic field has a magnitude of B = 0.50 T. (a) What is the energy difference between the magnetic moment orientations of the silver atoms in the two subbeams? (b) What is the frequency of the radiation that would induce a transition between these two states? (c) What is the wavelength of this radiation, and (d) to what part of the electromagnetic spectrum does it belong?

The Terrible Tinkerer—an evil-doing engineer—has trapped a frightened citizen on a 700 kg horizontally oscillating platform. The effective spring constant of the oscillator is 200 N/m and the mass of the citizen, who understandably is clinging on to the platform for dear life, is 70.0 kg. It all started when the unsuspecting citizen stepped onto the platform while high upon a bridge. The trapped platform then broke away and began oscillating starting from rest +40.0 m from equilibrium carrying the unsuspecting citizen with it.

a) What is the angular frequency and frequency of the motion?

b) What is the period?

c) What are the amplitude and phase angle?

d) What is the total energy of the oscillator?

e) If it will take Spider-Man 9.20 seconds to arrive where will the platform & citizen be (location, x)?

f) What will be their velocity at 9.2 seconds in m/s and mph?

g) What is the maximum horizontal acceleration experienced by the citizen in g’s?

h) Spider-Man—being a good physicist—waits until the platform is at ? = +? again to carefully remove the citizen from the platform. How long after 9.20 seconds does he have to wait?

i) What is the period of oscillation after the citizen is removed?

j) What is the total energy of the oscillator after the citizen is removed?

Two resistors have resistances R(smaller) and R(larger), where R(smaller) < R(larger). When the resistors are connected in series to a 12.0-V battery, the current from the battery is 1.43 A. When the resistors are connected in parallel to the battery, the total current from the battery is 9.95 A. Determine the two resistances.

A 79.0-kg fullback running east with a speed of 5.20 m/s is tackled by a 97.0-kg opponent running north with a speed of 3.00 m/s.

(a) Explain why the successful tackle constitutes a perfectly inelastic collision.

This answer has not been graded yet.

(b) Calculate the velocity of the players immediately after the tackle.

(c) Determine the mechanical energy that disappears as a result of the collision.
J

Account for the missing energy.

I was trying to figure out the flow of electrons in a battery connected to a circuit. Conventionally, current is from the (+) terminal to the (-) terminal of the battery. Realistically it flows the other way round; from the (-) terminal to the (+) terminal. My question is, assuming electron flow is from the (-) terminal, would the battery's cathode be located at the (+) terminal and it's anode at the (-) terminal or would it be vice versa?

Another question: Why would the anode be positive in a device that consumes power and negative in a device that provides power?

Point charges of 6.25 µC and −3.50 µC are placed 0.350 m apart. (Assume the negative charge is located to the right of the positive charge. Include the sign of the value in your answers.)

(a)Where can a third charge be placed so that the net force on it is zero?

  m to the right of the −3.50 µC charge

(b)What if both charges are positive?

  m to the right of the 3.50 µC charge

Sand from a stationary hopper falls on a moving conveyor belt at the rate of 4.60 kg/s as in fig. P9.72. The conveyor belt is supported be frictionless rollers and moves at a constant speed of v = 0.820 m/s under the action of a consant horizontal external force Fext supplied by the motor that drives the belt.

(a) Find the sand's rate of change of momentum in the hortizontal direction. N

(B) Find the force of friction exerted by the belt on the sand. N

(c) find the external force Fext. N

(d) Find the work done by Fext in 1 second. J

(e) Find the kinetic energy acquired by the falling sand each second due to the change in its hortizontal motion. J

(f) Why are the answers to parts (d) and (e) different?

Please let me know which is true or false and reasons.

11. Both the linear momentum and the kinetic energy are conserved during elastic collisions.

12. Consider a rigid-body rotating freely around a fixed point. Its moment of inertia is generally a scalar value.

13. The parallel axis theorem implies that the moment of inertia of a rigid body is minimum around its center of mass.

14. For single point particle rotating freely around a fixed point, the direction of torque (non-zero) is always perpendicular to the applied external force.

15. In a physical system, if the total linear momentum is conserved, then the total angular momentum is conserved as well.

16. A rolling motion can be understood as a combination of a pure rotation and a pure translation.

17. In the case of the smooth rolling under gravitational force, the work done by static frictional force is zero.

18. A spherical object ? (mass ? and radius ?) and another spherical object ? (mass ? and radius ?) are smoothly rolling down identical slopes with the same initial conditions. If the object ? reaches the ground faster, then the moment of inertia of the object ? is larger than the object ?.

19. When the angular momentum of a physical system is conserved, then its mechanical energy is conserved as well.

20. A metal solid with a very high young’s modulus is difficult to stretch.

Three point charges are placed on the x-axis. A charge of +2.0 μC is placed at the origin, -2.0 μC to the right at x = 50 cm, and +4.0 μC at the 100 cm mark. What are the magnitude and direction of the electrostatic force which acts on the charge at the origin?

• 2. A spring whose coefficient is k is compressed by length d and a block of mass m is placed right next to the end of the spring. When the spring is released, the block acquires a velocity and keeps on moving along a horizontal smooth surface until it reaches an inclined plane whose angle is θ and whose coefficient of friction with the block is μ. It travels up the inclined plane for a while before reaching maximum height.

• a) What is the change of the kinetic energy of the block?

• b) What is the change of the potential energy of the spring?

• c) Whatisthechangeofthegravitationalpotentialenergy?

• d) What is the change of the total energy of the system?

• e) What is the work done by non-conservative forces?

• f) Use these results to find the maximum height h as a function of the other variables.

Breanna is standing beside a merry-go-round pushing 14° from the tangential direction and is able to accelerate the ride and her friends from rest to a frequency of 13 rpm in 9 seconds. Assume the merry-go-round is a uniform disc of radius 2.3 m and has a mass of 750 kg. Rachel (56 kg) and Tayler (57 kg) sit opposite each other on the edge of the ride.