What is the change in the form of energy that is shown by the change in direction of the compass needle when an electric current is passed beneath it?

When the magnet is moved inside the coil of wire, what does the Galvinometer indicate?

Would making the fixed magnet stronger, have an effect on the amount of current produced?

A 320 g block is dropped onto a relaxed vertical spring that has a spring constant of k = 1.8 N/cm (see the figure). The block becomes attached to the spring and compresses the spring 10 cm before momentarily stopping. While the spring is being compressed, what work is done on the block by (a) the gravitational force on it and (b) the spring force? (c) What is the speed of the block just before it hits the spring? (Assume that friction is negligible.) (d) If the speed at impact is doubled, what is the maximum compression of the spring?

thermodynamics:

Explain why the properties of liquids can be estimated (with reasonable accuracy) as a function of temperature only

The density of a 10 kg cube of silver is 10.5 g/cm³. What would the density of a 5 kg cube of silver be?

I thought the answer would be 5.25 g/cm^3 because m1/m2=p1/p2 so 10kg/5kg=10.5 g/cm^3/ x and you solve for x. But this is coming up as wrong and I don't know why, do i need to convert the kg to g???

A 10.3 g wire has a density of 5.9 g/cm3 and a resistivity of 1.51 × 10−7 Ω · m . The wire has a resistance of 106 Ω . How long is the wire? The wire is made up of atoms with molecular mass 48 g/mol. What is the drift speed of the electrons when there is a voltage drop of 243.8 V across the wire? Assume there is one conduction electron per atom. The fundamental charge is 1.602 × 10−19 C. Answer in units of m/s.

what are the equations or procedure for the following questions 2.Capacitor wired with a resistor, find the time constant. 3.The magnetic field generated by a current at distance d from the wire, and the directions 4.The magnetic field in a solenoid, 5- The efficiency, number of turns, and the voltages of the transformer 6- The equivalent capacitance in combination. 7- Resistors code. 8- The resonance frequency.

The drawing shows an edge-on view of two planar surfaces that intersect and are mutually perpendicular. Surface 1 has an area of 1.5 m2, while surface 2 has an area of 3.4 m2. The electric field E in the drawing is uniform and has a magnitude of 190 N/C. It is directed towards the two perpendicular surfaces, making an angle 35o with the bottom surface. Find the electric flux through (a) surface 1 and (b) surface 2.

A 4.26-kg block starts up a 33.0˚ incline at 7.81 m/s. (a) How far will it slide if it loses 34.6 J of mechanical energy due to friction? (b) What is the coefficient of kinetic friction between the block and the incline

A weight is attached to a spring suspended from a beam. At time t = 0, it is pulled down to a point 7 cm above the ground and released. After that, it bounces up and down between its minimum height of 7 cm and a maximum height of 25 cm, and its height h(t) is a sinusoidal function of time t. It first reaches a maximum height 1.4 seconds after starting.

(b) What are the mean, amplitude, phase shift and period for this function? (Use a phase shift with an absolute value less than the period.)

(c) Give four different possible values for the phase shift. (Enter your answers as a comma-separated list.)

(d) Write down a formula for the function h(t) in standard sinusoidal form; i.e. as in the equation shown below.

h(t) = A sin (2pi/B (t-C)) + D

(e) What is the height of the weight after 4.2 seconds?

Q10. Assume that the Earth is orbiting the sun in a perfectly circular orbit. If the Earth is hit by a huge meteorite but its orbiting angular momentum is not changed (this can be the case if the hit is along the radial direction of the orbit), what would be the change in Earth’s orbit?

A. No change

B. Earth would move in a circular orbit with a larger radius

C. Earth would move in a circular orbit with a smaller radius

D. Earth’s orbit would not change, but its period is lengthened

E. Earth’s orbit would become elliptical

Three children are riding on the edge of a merry‑go‑round that has a mass of 105 kg and a radius of 1.70 m . The merry‑go‑round is spinning at 24.0 rpm. The children have masses of 22.0, 28.0, and 33.0 kg. If the 28.0 kg child moves to the center of the merry‑go‑round, what is the new angular velocity in revolutions per minute? Ignore friction, and assume that the merry‑go‑round can be treated as a solid disk and the children as point masses. final angular velocity: rpm

A white billiard ball with mass m_w = 1.5 kg is moving directly to the right with a speed of v = 3 m/s and collides elastically with a black billiard ball with the same mass m_b = 1.5 kg that is initially at rest. The two collide elastically and the white ball ends up moving at an angle above the horizontal of θ_w = 30° and the black ball ends up moving at an angle below the horizontal of θ_b = 60°.

1)

What is the final speed of the white ball?
m/s

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2)

What is the final speed of the black ball?
m/s

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3)

What is the magnitude of the final total momentum of the system?
kg-m/s

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4)

What is the final total energy of the system?
J

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A railroad freight car rolls on a track at 2.65 m/s toward two identical coupled freight cars, which are rolling in the same direction as the first, but at a speed of 1.20 m/s. The first reaches the second two and all couple together. The mass of each is 2.30 ✕ 10⁴ kg.

(a) What is the speed (in m/s) of the three coupled cars after the first couples with the other two? (Round your answer to at least two decimal places.)

(b)Find the (absolute value of the) amount of kinetic energy (in J) converted to other forms during the collision.

A block of mass m1 = 1.60 kg initially moving to the right with a speed of 4.00 m / s on a track
horizontal without friction and collides with a spring attached to a second block of mass m2 = 2.10 kg that initially
moves to the left with a speed of 2.50 m / s. The spring constant is 600 N / m.
a) Find the speeds of the two blocks after the collision.
b) During the collision, at the instant when block 1 moves to the right with a speed of 3.00 m / s, determine the
speed of block 2.
c) Determine the distance that the spring is compressed at that instant.

Describe the evidence for a supermassive black hole at the center of our Galaxy.