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The potential energy of a system of two atoms is given by the expression:
𝑈 = − 𝐴 𝑟
2 ⁄ + 𝐵 𝑟
10 ⁄
A stable molecule is formed with release of 8.0 eV of energy when the interatomic distance is
2.8 Å.
i. Calculate A and B. [4 marks]
ii. Determine the force needed to dissociate this molecule into atoms and the interatomic
distance at which the dissociation occurs.
Find the current (I1, I2, and I3) in each branch of the circuit using Kirchhoff's Laws.
Six Christmas tree lights are arranged in parallel circuit as shown in the figure. Each bulb dissipates 10W when operated at 120V. (a) What is the resistance R of each bulb? (b) What is the resistance of the entire array of bulbs? (c) What is the total power consumption of the array? (d) What are the currents at points a, b, c, and d?
Supposed the battery in the figure is 45 V and the resistor R1 = 300 ohms. (a) What must the resistor R2 be in order that the current I be 0.45 A? (b) What are the currents I1 and I2?
Three resistances of 12, 16, and 20 ohms are connected in parallel. What resistance must be connected in series with this combination to give a total resistance of 25 ohms?
an object 7m high is placed 15cm from a convex spherical mirror of radius of curvature 45cm.describe its image
Dry steam at 100°C is bubbled into 500g of water originally at 20°C. What will be the temperature of the water after 30g of steam has condensed? Specific latent heat of steam is 2.26*10^6J/k, specific heat capacity of water is 4200J/Kg/k
- A rocket has an initial mass of 2 x 104 kg, a mass ratio of 3, a burning rate of 100 kg/sec, and an exhaust velocity of 980 m/sec. The rocket is fired vertically from the surface of the earth. How long after ignition of the engines will the rocket leave the ground? (R1P14-3, 493)
How far away was the cannon?
The flight path of a jet aircraft as it takes off from the Nnamdi Azikiwe airport Abuja,is defined by the parametric equations x=1.25t^2 and y=0.03t^3,Where t, is the time after take off measured in seconds and X and Y are given in meters.At t=40 (just before it starts to level off).calculate at this instant it's speed
