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A pendulum is formed from a small rock with mass of 0.10 kg that is fastened to a massless string
with length 0.750 m. It is swinging so as to make a maximum angle of 45.0 with the vertical. Air
resistance is negligible. What is the tension in the string as it passes through the vertical?
An ideal spring of negligible mass with force constant of 400 N/m is placed on a frictionless horizonal
table with one end fixed at a wall next to the table. A billiard ball of mass 200 g is pushed against the spring, compressing the spring to some distance. After the system is released, the spring returns to equilibrium with the billiard ball leaving the table's edge at 4.00 m/s and hits the floor 80 cm below. Using the principle of energy conservation, (a) determine the initial compression of the spring. (b) What is the speed of the ball when it hits the floor?
A spherical asteroid has a radius of 500 km and the gravitational acceleration on the surface of the asteroid is 3 m/s?. (a) What is the minimum kinetic energy required for a 20 kg of object to escape from the asteroid? (b) At what speed will the object hit the surface of the asteroid if it is dropped from a height of 10 km?
1. A point charge q = 2.00μC is located at the origin. Find the electric potential due to this charge at point x = 4.0 m.
A. 1500V C. 3500V
B. 2500V D. 4500V
2. Two point charges are arranged along the x-axis; q₁-2.0 μC is at x=0.80m, and q2-2.0 μC at x=0.80m. The net electrical potential measured at the origin due to these point charges is
A. Zero C. 22500V
B. 4500V D. 45000V
A Carnot engine has an efficiency of 50% when it sinks temperature is at 27 degree celcius calculate the change in source temperature for increasing its efficiency to 60%
What is the capacitance of a parallel plate capacitor with metal plates, each of area 1.00 m2, separated by 1.00 mm?
The brick wall (of thermal conductivity 1.15 W/m · ◦ C) of a building has dimensions of 2.8 m by 9 m and is 24 cm thick. How much heat flows through the wall in a 5.5 h period when the average inside and outside temperatures are, respectively, 19◦C and 5◦C? Answer in units of MJ.
Three liquids are at temperatures of 6 ◦C, 20◦C, and 34◦C, respectively. Equal masses of the first two liquids are mixed, and the equilibrium temperature is 17◦C. Equal masses of the second and third are then mixed, and the equilibrium temperature is 25.3 ◦C. Find the equilibrium temperature when equal masses of the first and third are mixed. Answer in units of ◦C.
a) As the meteor falls through the atmosphere the gravitational force continues to act on it. Suppose in a given instance the meteor is at a distance of 4000 km from earth. What would be the direction of the force that acts on it at that location?
b) Imagine it has approached near earth and now it is at a distance of 400 km from earth. What will be the direction of the gravitational force now?
When a meteor falls on earth across the earth's atmosphere there acts 3 forces on it. 2 of them are the gravity and the upthrust. Mention the third force.
