Other Physics Answers

If a cord is under a tension of F T = 135 N, and has a mass per unit length of 0.10 kg/m, what power is

required to transmit a 120-Hz transverse wave of amplitude 2.0 cm?

Two earthquake waves of the same frequency travel through the same portion of the Earth, but one is

carrying 3.0 times the energy. What is the ratio of the amplitudes of the two waves?

A petrol tanker has mass 2800kg when empty and holds 30m³ of petrol when full . The density of petrol is 740kg/m³

a. Calculate the total mass of the tanker when full of petrol

b. The full tanker is travelling along a road when the driver observes an obstruction and applies the brakes. A resultant force of 30000N acts on the tanker. Calculate the deceleration of the tanker

A fidget spinner of radius 0.05 m has a moment of inertia kg m2

and

is rotating at 8.4 rad s-1

. A large fly whose mass is 0.3 kg lands onto the edge of

the rotating spinner. Calculate the angular speed of the system after the fly falling

onto the spinner.

A fidget spinner of radius 0.05 m has a moment of inertia1.25×10^-4 kg m2

and 

is rotating at 8.4 rad s-1

. A large fly whose mass is 0.3 kg lands onto the edge of 

the rotating spinner. Calculate the angular speed of the system after the fly falling 

onto the spinner. 

A raw egg and a hard-boiled egg are rotating about the same axis of rotation with 

the same initial angular velocity. With the aid of diagram, explain which egg will 

rotate longer. 

 a 1.5 kg block is hung by a light string which is wound around a 

 smooth pulley of radius 20 cm. The moment of inertia of the pulley is 2 kg m2

. 

(i) Sketch the free body diagram of the 1.5 kg block.

(ii) When the mass is released from rest, calculate the angular velocity and number of 

revolutions of the pulley at t = 4.2 s.

7. Based on Coulomb's Law V=keq1q2r how we can make comparison between ionization energy of Rubidium (Rb) and Krypton (Kr)?

3. For potential energy, V, in Coulomb’s Law to be a large negative number which of the following should be true? Where a constant, r is the radius, and qn are point charges. V=keq1q2r2

A. r is very small and both charges should have opposite signs 

B. r is very small and both charges should be the same sign.

C. r is very large and both charges have opposite signs.

 D. r is very large and both charges should be the same sign.