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Rishva SAGAR

Rishva S.

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Viewed Questions

(I) A 110-kg tackler moving at 2.5 ms meets head-on (and holds on to) an 82-kg halfback moving at 5.0 m/s. What will be their mutual speed immediately after the collision?

(I) A 110-kg tackler moving at 2.5 ms meets head-on (and holds on to) an 82-kg halfback moving at 5.0 m/s. What will be their mutual speed immediately after the collision?

Physics: Principles with Applications

LINEAR MOMENTUM

Momentum and Its Relation to Force
(II) Estimate the work you do to mow a lawn 10 m by 20 m with a 50-cm-wide mower. Assume you push with a force of about 15 N.

(II) Estimate the work you do to mow a lawn 10 m by 20 m with a 50-cm-wide mower. Assume you push with a force of about 15 N.

Physics: Principles with Applications

WORK AND ENERGY

Work Done by a Constant Force
The 20 -kg crate is subjected to a force having a constant direction and a magnitude $F=100 \mathrm{N}$. When $s=15 \mathrm{m}$, the crate is moving to the right with a speed of $8 \mathrm{m} / \mathrm{s}$ Determine its speed when $s=25 \mathrm{m}$. The coefficient of kinetic friction between the crate and the ground is $\mu_{k}=0.25$

The 20 -kg crate is subjected to a force having a constant direction and a magnitude $F=100 \mathrm{N}$. When $s=15 \mathrm{m}$, the crate is moving to the right with a speed of $8 \mathrm{m} / \mathrm{s}$ Determine its speed when $s=25 \mathrm{m}$. The coefficient of kinetic friction between the crate and the ground is $\mu_{k}=0.25$

Engineering Mechanics: Dynamics

Even when shut down after a period of normal use, a large commercial nuclear reactor transfers thermal energy at the rate of 150 MW by the radioactive decay of fission products. This heat transfer causes a rapid increase in temperature if the cooling system fails (1 watt = 1 joule/second or 1 W = 1 J/s and 1 MW = 1 megawatt) . (a) Calculate the rate of temperature increase in degrees Celsius per second $\left(^{\circ} \mathrm{C} / \mathrm{s}\right)$ if the mass of the reactor core is $1.60 \times 10^{5} \mathrm{kg}$ and it has an average specific heat of 0.3349 $\mathrm{kJ} / \mathrm{kg}^{\circ} \cdot \mathrm{C}$. (b) How long would it take to obtain a temperature increase of $2000^{\circ} \mathrm{C}$ metals holding the radioactive materials to melt? (The initial rate of temperature increase would be greater than that calculated here because the heat transfer is concentrated in a smaller mass. Later, however, the temperature increase would slow down because the $5 \times 10^{5}$ -kg steel containment vessel would also begin to heat up.)

Even when shut down after a period of normal use, a large commercial nuclear reactor transfers thermal energy at the rate of 150 MW by the radioactive decay of fission products. This heat transfer causes a rapid increase in temperature if the cooling system fails (1 watt = 1 joule/second or 1 W = 1 J/s and 1 MW = 1 megawatt) . (a) Calculate the rate of temperature increase in degrees Celsius per second $\left(^{\circ} \mathrm{C} / \mathrm{s}\right)$ if the mass of the reactor core is $1.60 \times 10^{5} \mathrm{kg}$ and it has an average specific heat of 0.3349 $\mathrm{kJ} / \mathrm{kg}^{\circ} \cdot \mathrm{C}$. (b) How long would it take to obtain a temperature increase of $2000^{\circ} \mathrm{C}$ metals holding the radioactive materials to melt? (The initial rate of temperature increase would be greater than that calculated here because the heat transfer is concentrated in a smaller mass. Later, however, the temperature increase would slow down because the $5 \times 10^{5}$ -kg steel containment vessel would also begin to heat up.)

College Physics for AP® Courses

Questions asked

INSTANT ANSWER

Even when shut down after a period of normal use, a large commercial nuclear reactor transfers thermal energy at the rate of 150 MW by the radioactive decay of fission products. This heat transfer causes a rapid increase in temperature if the cooling system fails. [Properties of steel vessel: cp=470 J/kg.oC, melting point=1430 oC and Lf=270 kJ/kg] a) Calculate the rate of temperature increase in degrees Celsius per second (ºC/s) if the mass of the reactor core is 1.60×105 kg and it has an average specific heat of 0.3349 kJ/kgº C. [2 marks] b) How long would it take to obtain a temperature increase of 200ºC? [2 marks] c) Considering the same rate of thermal energy transfer (150 MW) to the steel containment vessel, how long it will take to melt 1.00% of the steel vessel? (Assume, the initial temperature and mass of steel containment vessel are 300oC and 5×105 kg respectively.) [4 marks] d) Make a graph of temperature versus time for the process in question (c). [2 marks]

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ANSWERED

Penny Riley verified

Numerade educator

A space station is designed to be operated outside of the Earth’s gravitational field. The structure is given a rotation from rest to a speed “𝝎” which will simulate the effect of Earth’s gravity, g=9.81m/s2 , (centripetal acceleration) in the crew quarters located 12 m from the axis of rotation. Assume, a uniform rate of increase in angular speed. Calculate, a) the rotational speed (𝝎), reporting your result in revolutions per minutes, [3 marks] b) the angular acceleration, [2 marks] c) the tangential acceleration, [2 marks] d) the net force (Magnitude and direction) being exerted on a crew of 60 kg mass in one of the quarters at the instance of the structure reaching the speed “𝝎”.[3 marks]

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INSTANT ANSWER

Even when shut down after a period of normal use, a large commercial nuclear reactor transfers thermal energy at the rate of 150 MW by the radioactive decay of fission products. This heat transfer causes a rapid increase in temperature if the cooling system fails. [Properties of steel vessel: cp=470 J/kg.oC, melting point=1430 oC and Lf=270 kJ/kg] a) Calculate the rate of temperature increase in degrees Celsius per second (ºC/s) if the mass of the reactor core is 1.60×105 kg and it has an average specific heat of 0.3349 kJ/kgº C. [2 marks] b) How long would it take to obtain a temperature increase of 200ºC? [2 marks] c) Considering the same rate of thermal energy transfer (150 MW) to the steel containment vessel, how long it will take to melt 1.00% of the steel vessel? (Assume, the initial temperature and mass of steel containment vessel are 300oC and 5×105 kg respectively.) [4 marks] d) Make a graph of temperature versus time for the process in question (c). [2 marks]

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ANSWERED

Emily Anderson verified

Numerade educator

A 20 kg crate is subject to a force having a constant direction and magnitude of F = 100 N at 30 degree from the horizontal. The crate is moving to the right with an initial speed of 8 m/s. The coefficient of kinetic friction between the crate and the ground is μk = 0.25. a) Draw the free body diagram of the crate. [2 marks] b) Using Newton’s Laws of motion, determine the speed of the crate when it is moved a distance, s = 21 m, [4 marks] c) Using energy conservation law, recalculate its speed when s=21 m. [4 marks]

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ANSWERED

Ivan Kochetkov verified

Numerade educator

A 20 kg crate is subject to a force having a constant direction and magnitude of F = 100 N at 30 degree from the horizontal. The crate is moving to the right with an initial speed of 8 m/s. The coefficient of kinetic friction between the crate and the ground is μk = 0.25. a) Draw the free body diagram of the crate. [2 marks] b) Using Newton’s Laws of motion, determine the speed of the crate when it is moved a distance, s = 21 m, [4 marks] c) Using energy conservation law, recalculate its speed when s=21 m. [4 marks]

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