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Physics 101 Mechanics Q&A Archive of November 6, 2021

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November 6 of 2021

If you have a manometer with a 50cm tall water column, what is the largest pressure that can be measured? Assume that the densities of water and mercury are 1000 kg/m3 and 13 600 kg/m3 respectively
The drawing below shows a lower leg being exercised. The lower leg has a 49N weight attached to the foot and it is extended at an angle ? with respect to the vertical. The lower leg rotates about the axis of the knee as shown in the diagram below. At what angle ?, does the magnitude of the…
Bovine serum albumin (BSA) molecules have a diffusion coefficient of 1.22 × 10–11 m2/s in the cytoplasm of a mammalian cell. How long will it take for a large number of BSA molecules to travel a root mean square distance of 15 µm through a mammalian cell?
A metal bar is used to conduct heat. When the temperature at one end is 100°C and at the other is 40°C, heat is transferred at a rate of 20 J/s. If the temperature of the hotter end is reduced to 70°C, what will be the rate of heat transfer?
A naked man eats a dessert that contains 900 kJ of energy. The skin temperature of the man is 36°C and the room he is standing in is at 18°C. The emissivity of his skin is 0.77 and its surface area is 1.1 m2. How many hours would it take him to emit a net radiant energy from his body that is…
The coefficient of linear expansion for silver is 19×10–6/°C. The density of silver is 10500 kg/m3 at 0.0 °C. What is the density of silver at 700 °C?
A tube has a length of 0.040 m and a cross-sectional area of 3.8 × 10–4 m2. The tube is filled with a solution of sucrose in water. The diffusion constant of sucrose in water is 5.0 × 10–10 m2/s. A difference in concentration of 4.1 × 10–3 kg/m3 is maintained between the ends of a tube. How…
A room is at a temperature of 20°C. The pressure in the room is 101.3 kPa and the room is 4 metres long, 3 metres wide and 2.3 metres high. The total translational kinetic energy of the air particles in the room is:
A metal bar is used to conduct heat. When the temperature at one end is 100°C and at the other is 40°C, heat is transferred at a rate of 20 J/s. If the temperature of the hotter end is reduced to 70°C, what will be the rate of heat transfer?
The coefficient of linear expansion for silver is 19×10–6/°C. The density of silver is 10500 kg/m3 at 0.0 °C. What is the density of silver at 700 °C?
A naked man eats a dessert that contains 900 kJ of energy. The skin temperature of the man is 36°C and the room he is standing in is at 18°C. The emissivity of his skin is 0.77 and its surface area is 1.1 m2. How many hours would it take him to emit a net radiant energy from his body that is…
A tube has a length of 0.040 m and a cross-sectional area of 3.8 × 10–4 m2. The tube is filled with a solution of sucrose in water. The diffusion constant of sucrose in water is 5.0 × 10–10 m2/s. A difference in concentration of 4.1 × 10–3 kg/m3 is maintained between the ends of a tube. How…
Two forces act on a 10 kg object. The first force has a magnitude of 100 N and is directed north. The second force is 120 N, 30° south of west. What is the acceleration of the object resulting from the application of these two forces to the object?
A rollercoaster car is moving down a slope at 10 m/s at point A. Point A is 20.0 metres above the ground. It goes around a loop. At point B (the top of the loop) the car is moving at 15 m/s. What is the height of point B above the ground? Assume that frictional losses are negligible
A 50.0 kg boy runs at a velocity of 10.0 m/s to the right and jumps onto a cart as shown in the figure. The cart is initially moving to the left at 2.0 m/s. If the velocity of the cart with the boy on it is 2.5 m/s to the right, what is the mass of the cart?
An ice hockey puck is sliding across a level ice surface. The speed of the puck decreases at a rate of 0.61 m/s2. The coefficient of kinetic friction between the puck and ice is:
A car traveling along a road begins accelerating with a constant acceleration of 1.5 m/s2 in the direction of motion. After traveling 392 m at this acceleration, its speed is 35 m/s. Determine the speed of the car when it began accelerating.
Mary and Bob are riding scooters and approach each other at an intersection. Mary is traveling north at 20 m/s with respect to the ground, while Bob is travelling west at 17 m/s with respect to the ground. What is the velocity of Mary as described by Bob i.e. what is the velocity of Mary with…
how to make a piecewise function from a cartesian plane
When your receiver is too far from AM KSPN, you can only hear the loud parts of the transmission. In contrast, when it's too far from FM KUCR, you lose the whole sound all at once. Which of the following statement(s) are correct.
how can we make a roller coaster using the piecewise functions
Convert 79joule to calorie.
Please convert 6.67 mililitre to litre.
A ball is dropped from the height h1 and if re-bounces to a height h2 . Find the value of coefficient of restitution.
Why is mercury used in making thermometers?
Convert 5cm to km
Help to answer
Solution?
The drawing below shows a lower leg being exercised. The lower leg has a 49N weight attached to the foot and it is extended at an angle ? with respect to the vertical. The lower leg rotates about the axis of the knee as shown in the diagram below. At what angle ?, does the magnitude of the…
Bovine serum albumin (BSA) molecules have a diffusion coefficient of 1.22 × 10–11 m2/s in the cytoplasm of a mammalian cell. How long will it take for a large number of BSA molecules to travel a root mean square distance of 15 µm through a mammalian cell?
A metal bar is used to conduct heat. When the temperature at one end is 100°C and at the other is 40°C, heat is transferred at a rate of 20 J/s. If the temperature of the hotter end is reduced to 70°C, what will be the rate of heat transfer?
The coefficient of linear expansion for silver is 19×10–6/°C. The density of silver is 10500 kg/m3 at 0.0 °C. What is the density of silver at 700 °C?
A tube has a length of 0.040 m and a cross-sectional area of 3.8 × 10–4 m2. The tube is filled with a solution of sucrose in water. The diffusion constant of sucrose in water is 5.0 × 10–10 m2/s. A difference in concentration of 4.1 × 10–3 kg/m3 is maintained between the ends of a tube. How…
A room is at a temperature of 20°C. The pressure in the room is 101.3 kPa and the room is 4 metres long, 3 metres wide and 2.3 metres high. The total translational kinetic energy of the air particles in the room is:
The coefficient of linear expansion for silver is 19×10–6/°C. The density of silver is 10500 kg/m3 at 0.0 °C. What is the density of silver at 700 °C?
A naked man eats a dessert that contains 900 kJ of energy. The skin temperature of the man is 36°C and the room he is standing in is at 18°C. The emissivity of his skin is 0.77 and its surface area is 1.1 m2. How many hours would it take him to emit a net radiant energy from his body that is…
A tube has a length of 0.040 m and a cross-sectional area of 3.8 × 10–4 m2. The tube is filled with a solution of sucrose in water. The diffusion constant of sucrose in water is 5.0 × 10–10 m2/s. A difference in concentration of 4.1 × 10–3 kg/m3 is maintained between the ends of a tube. How…
A rollercoaster car is moving down a slope at 10 m/s at point A. Point A is 20.0 metres above the ground. It goes around a loop. At point B (the top of the loop) the car is moving at 15 m/s. What is the height of point B above the ground? Assume that frictional losses are negligible
A 50.0 kg boy runs at a velocity of 10.0 m/s to the right and jumps onto a cart as shown in the figure. The cart is initially moving to the left at 2.0 m/s. If the velocity of the cart with the boy on it is 2.5 m/s to the right, what is the mass of the cart?
An ice hockey puck is sliding across a level ice surface. The speed of the puck decreases at a rate of 0.61 m/s2. The coefficient of kinetic friction between the puck and ice is:
A car traveling along a road begins accelerating with a constant acceleration of 1.5 m/s2 in the direction of motion. After traveling 392 m at this acceleration, its speed is 35 m/s. Determine the speed of the car when it began accelerating.
Mary and Bob are riding scooters and approach each other at an intersection. Mary is traveling north at 20 m/s with respect to the ground, while Bob is travelling west at 17 m/s with respect to the ground. What is the velocity of Mary as described by Bob i.e. what is the velocity of Mary with…
how to make a piecewise function from a cartesian plane
When your receiver is too far from AM KSPN, you can only hear the loud parts of the transmission. In contrast, when it's too far from FM KUCR, you lose the whole sound all at once. Which of the following statement(s) are correct.
how can we make a roller coaster using the piecewise functions
Convert 79joule to calorie.
Please convert 6.67 mililitre to litre.
A ball is dropped from the height h1 and if re-bounces to a height h2 . Find the value of coefficient of restitution.
Why is mercury used in making thermometers?
Convert 5cm to km
Solution?