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Physics 101 Mechanics Q&A Archive of November 9, 2021

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November 9 of 2021

You Decide To Flip A Coin To Determine Whether To Do Your Physics Or English Homework Fest. The Coin Is Flipped Straight Up
two large( we may treat as infinite0 square plates, with an area of 0.2m^2 are placed 2cm apart. The plates have an equal and opposite charge put on them q=5x10^6c
Two vessels in which the difference of surface levels is maintained constant at 2.4 m are connected by a 75 mm diameter pipeline 15 m long. If the frictional coefficient f may be taken as 0.008, determine the volume rate of flow.
A satellite orbits the Earth with a period of 24 hours. The radius of Earth is 6400 km and the mass of Earth is 6.0 x 1024 kg. Determine the height of the satellite above the Earth’s surface.
The ball shown in the diagram is attached to a rotating pole with two strings. The ball has a mass of 0.250 kg and rotates in a horizontal circle at a speed of 8.0 ms 1. Determine the tension in each string.
The ball shown in the diagram is attached to a rotating pole with two strings. The ball has a mass of 0.250 kg and rotates in a horizontal circle at a speed of 8.0 ms 1. Determine the tension in each string.
Two logs with masses m1 and m2 are connected by a very light rope that goes through a very light pulley (see picture below). The friction in the pulley is negligible. The first log rests on a rough table, 2. log hangs over the edge of the table. ktr is the coefficient of friction between the…
A heating element is marked 210 V, 630 W. What is the value of the current drawn by the element when connected to a 210 V dc source?
A steel sphere with a diameter of 10 cm is to be hardened by first heating it to a uniform temperature of 850 oC and then quenching it in a large bath of water at 35 oC. The heat-transfer coefficient at the surface of the sphere is 500 W/m2K. Using the appropriate transient Conduction charts…
The recommended daily intake for the average person is about 2200 calories. In 2014, the average American consumed about 3800 calories daily(a) With what average power would the average American have to work with in order to consume excess-daily calories? Consider 1 calorie = 4, 18J.(b) For how…
Two logs with masses m1 and m2 are connected by a very light rope that goes through a very light pulley (see picture below). The friction in the pulley is negligible. The first log rests on a rough table, log 2 hangs over the edge of the table. ktr is the coefficient of friction between the 1st…
The variables controlling the motion of a floating vessel through water are the drag force f, the speed ?, the length l, the density ?, and dynamic viscosity µ, of the water and the gravitational acceleration g. derive and expression for F by dimensional analysis
A bar of length L and cross-sectional area A
SS Prima Vista, a theater and cruise ship, sailed through the Atlantic for its one-week performance cruise. It left the Port de Marseille early morning with a velocity of 48 kph going north, then 40 kph 70° N of E, then headed straight for the Réstaurant Glacier le Commodore at 48 kph, which is…
E. R 14 800.00 7. Which of the following equations are the units on the left side of the equals sign consistent with the units on the right side
4- A soft drink manufacturer claims that a new diet drink is "low Joule." The label indicates the available energy is \( 6300 \mathrm{~J} \). What is the equivalent of this energy in Calories ( 1 Calorie \( =1000 \) cal)? (a) \( 0.015 \mathrm{Cal} \) (b) \( 1.0 \mathrm{Cal} \) (c) \( 4.8…
The Moon’s mass and radius are 0.0123 ME and 0.273 RE (E = Earth). For Jupiter the corresponding figures are 318 ME and 11.0 RE. Find in each case the gravitational acceleration at the surface and the escape velocity
2. A particle of mass m is confined to a parabolic surface of rotation z = a?2, where ? = ?x2 + y2. The graviational potential is U = mgz. a) Show the Lagrangian is L = 1 2 m ? z? 2 + ?? 2 + ?2 ??2 ? ? mgz subject to the constraint that z = a?2, i.e. the particle remains on the…
The conductivity of 0.20 M solution of KCl at 298 K is 0.025 S cm-1. Calculate its molar conductivity.
What is the molarity of a solution containing 72.9 grams of HCl in enough water to make 500 mL of solution?
A woman pulls up on a 5 kg bucket. How hard would the woman have to pull to make the bucket rise at a constant speed?
A 40 Kg object in space is pushed by three forces. One force is 50N. Another force, exactly opposite in direction to the first force, is 35N. If the acceleration is 2 m/s/s, what are two possibilities for the third force?
A 10 kg object is pushed by three forces. One force is 20N. Another force is also 20N. If the object travels at constant speed, draw a free-body diagram of the two forces and the third force. (hint: there are many possible answers.)
An 8 kg object is on a horizontal, friction-free table. One person pushes the object to the right with a 50N force while another person pushes it to the left with a 30N force. If the object states at rest and travels for 20 meters, what is its final velocity?
A 5 kg object is pushed by two forces. One force is 30N. The other force, exactly opposite in direction to the first force, is 25N. What is the acceleration of the object.
The space ship ‘Heart of Gold’ is cruising at 4496 m/s when Zaphod Beeblebrox notices a space station 479 km in front of him. He starts to decelerate at 21.1 m/s2 . What is his speed when ‘Heart of Gold’ reaches the cargo bay of the space station?
two large( we may treat as infinite0 square plates, with an area of 0.2m^2 are placed 2cm apart. The plates have an equal and opposite charge put on them q=5x10^6c
Two vessels in which the difference of surface levels is maintained constant at 2.4 m are connected by a 75 mm diameter pipeline 15 m long. If the frictional coefficient f may be taken as 0.008, determine the volume rate of flow.
A satellite orbits the Earth with a period of 24 hours. The radius of Earth is 6400 km and the mass of Earth is 6.0 x 1024 kg. Determine the height of the satellite above the Earth’s surface.
The ball shown in the diagram is attached to a rotating pole with two strings. The ball has a mass of 0.250 kg and rotates in a horizontal circle at a speed of 8.0 ms 1. Determine the tension in each string.
The ball shown in the diagram is attached to a rotating pole with two strings. The ball has a mass of 0.250 kg and rotates in a horizontal circle at a speed of 8.0 ms 1. Determine the tension in each string.
Two logs with masses m1 and m2 are connected by a very light rope that goes through a very light pulley (see picture below). The friction in the pulley is negligible. The first log rests on a rough table, 2. log hangs over the edge of the table. ktr is the coefficient of friction between the…
A heating element is marked 210 V, 630 W. What is the value of the current drawn by the element when connected to a 210 V dc source?
A steel sphere with a diameter of 10 cm is to be hardened by first heating it to a uniform temperature of 850 oC and then quenching it in a large bath of water at 35 oC. The heat-transfer coefficient at the surface of the sphere is 500 W/m2K. Using the appropriate transient Conduction charts…
The recommended daily intake for the average person is about 2200 calories. In 2014, the average American consumed about 3800 calories daily(a) With what average power would the average American have to work with in order to consume excess-daily calories? Consider 1 calorie = 4, 18J.(b) For how…
Two logs with masses m1 and m2 are connected by a very light rope that goes through a very light pulley (see picture below). The friction in the pulley is negligible. The first log rests on a rough table, log 2 hangs over the edge of the table. ktr is the coefficient of friction between the 1st…
A bar of length L and cross-sectional area A
The Moon’s mass and radius are 0.0123 ME and 0.273 RE (E = Earth). For Jupiter the corresponding figures are 318 ME and 11.0 RE. Find in each case the gravitational acceleration at the surface and the escape velocity
The conductivity of 0.20 M solution of KCl at 298 K is 0.025 S cm-1. Calculate its molar conductivity.
What is the molarity of a solution containing 72.9 grams of HCl in enough water to make 500 mL of solution?
A woman pulls up on a 5 kg bucket. How hard would the woman have to pull to make the bucket rise at a constant speed?
A 40 Kg object in space is pushed by three forces. One force is 50N. Another force, exactly opposite in direction to the first force, is 35N. If the acceleration is 2 m/s/s, what are two possibilities for the third force?
A 10 kg object is pushed by three forces. One force is 20N. Another force is also 20N. If the object travels at constant speed, draw a free-body diagram of the two forces and the third force. (hint: there are many possible answers.)
An 8 kg object is on a horizontal, friction-free table. One person pushes the object to the right with a 50N force while another person pushes it to the left with a 30N force. If the object states at rest and travels for 20 meters, what is its final velocity?
A 5 kg object is pushed by two forces. One force is 30N. The other force, exactly opposite in direction to the first force, is 25N. What is the acceleration of the object.
The space ship ‘Heart of Gold’ is cruising at 4496 m/s when Zaphod Beeblebrox notices a space station 479 km in front of him. He starts to decelerate at 21.1 m/s2 . What is his speed when ‘Heart of Gold’ reaches the cargo bay of the space station?