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Physics 101 Mechanics Q&A Archive of November 30, 2021

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November 30 of 2021

13. Three point charges are arranged as shown in Figure. Find the vector force on the 5 \( \mathrm{nC} \) charge placed at origin.
find the torque on a wheelbarrow wheel
A \( 1800 \mathrm{~kg} \) vehicle traveling at \( 27 \mathrm{~m} / \mathrm{s} \) can be stopped in \( 30 \mathrm{~s} \) by gently applying the brakes. It can be stopped in \( 3.5 \mathrm{~s} \) if the driver slams on the brakes. It will stop in \( 0.23 \mathrm{~s} \) if it hits a concrete wall.…
1. An astronaut at rest in space fires a thruster pistol that expels a quick burst of \( 28 \mathrm{~g} \) of hot gas at \( 880 \mathrm{~m} / \mathrm{s} \). The combined mass of the astronaut and pistol is \( 85 \mathrm{~kg} \). How fast and in what direction is the astronaut moving after…
1- Find center of mass of a triangular plate the lengths of sides of which are 8 cm, 8 cm and 5 cm. please explain all steps!!
That average net force is required to bring a 700 kg car to rest from a speed of 65 km/hr in 30s?
Two particles, with masses m1 = 2.00 kg and m2 = 8.00 kg, are joined by a light rod of length L = 2.50 m. A force F = 15 N is applied to m1, perpendicular to the rod. a) Locate the centre of mass (“CM”), and calculate the moment of inertia about the CM, and the angular acceleration. b) Find…
A person sailing due North at 10 km/h observes an apparent wind moving at 10 kmhh directly from the boats starboard right hand side, ie 90 to the axis of the boat: a) What is the 'true' wind speed (the speed of thc wind with respect to the 'ground)? b) What is the direction of the 'true' wind?
Calculate the power of pump which can lift 100kg of water through a vertical height of 5m in 20sec
A crane lifts a 1000. kg load vertically 30.0 m at a constant velocity. What is the change in the load's gravitational potential energy?
Consider a manometer; which is an instrument used to measure pressure; which uses three different liquids for measurement: Water is colored in blue; mercury in silver/grey and oil is yellow/gold. Assuming that the gage pressure is P = 10[kPa] solve for the height d of the mercury on the…
Consider a manometer; which is an instrument used to measure pressure; which uses three different liquids for measurement: Water is colored in blue; mercury in silver/grey and oil is yellow/gold. Assuming that the gage pressure is P = 10[kPa] solve for the height d of the mercury on the…
Consider a manometer; which is an instrument used to measure pressure; which uses three different liquids for measurement: Water is colored in blue; mercury in silver/grey and oil is yellow/gold. Assuming that the gage pressure is P = 10[kPa] solve for the height d of the mercury on the…
Consider a manometer; which is an instrument used to measure pressure; which uses three different liquids for measurement: Water is colored in blue; mercury in silver/grey and oil is yellow/gold. Assuming that the gage pressure is P = 10[kPa] solve for the height d of the mercury on the…
f the box now is thrown upward with some initial kinetic energy, but its upward speed goes to zero at the height h of the shelf (so that it stores the same potential energy as in the previous problem), what was its initial kinetic energy?
Three forces of equal magnitude are applied to a 3-m by 2-m rectangle. Forces F1 and F2 act at 45 degree angles to the vertical as shown, while F3 act horizontally. a) Is the net torque about point A clockwise, counterclockwise, or zero? Explain answer.b)Is the net torque about point B…
\( \mathrm{~ M T B H - R T 6 1 : ~ H o p a t o w t a n . ~ P r o t r o ~ R o c a ~ m i m e ~ L o w s e s ~ a r ~ V a r e o r s ~ L o c a r n o w s} \) \( 5 \mathrm{Nx} \) is cotical Irictionlest pin. The fods are marked at half-mocter insovids Rank the mapnitude of the vartical force I applisd…
NTPC-RT19: HEXAGON-Tonoue anour Center Four foeces act os a plywood hesagon as shoun in the diapram. The sides of the hexagon each have a: length of l meler. Rank the magnitude of the toryue applicd abeut the ctnter of the hevagon by earh force. Grestest \( 1 \ldots 4 \) Leasl OR, The magnitude…
\( \mathrm{~ I n ~ e a c h ~ c a s e ~ b e l o w , ~ i s ~ w o o l e s ~ b o u r d ~ s e p p o w ~ c o t e ~ o f ~ r a p ~ b o c e s . ~ T u e ~ b o a n d} \) \( \mathrm{~ R c a n k ~ t h e s e ~ n a t u a t i k n ~ e s ~ t h e ~ b u r k ~ o f ~ i t w e ~} \) dievetiy above the left…
13. Three point charges are arranged as shown in Figure. Find the vector force on the 5 \( \mathrm{nC} \) charge placed at origin.
find the torque on a wheelbarrow wheel
A \( 1800 \mathrm{~kg} \) vehicle traveling at \( 27 \mathrm{~m} / \mathrm{s} \) can be stopped in \( 30 \mathrm{~s} \) by gently applying the brakes. It can be stopped in \( 3.5 \mathrm{~s} \) if the driver slams on the brakes. It will stop in \( 0.23 \mathrm{~s} \) if it hits a concrete wall.…
1. An astronaut at rest in space fires a thruster pistol that expels a quick burst of \( 28 \mathrm{~g} \) of hot gas at \( 880 \mathrm{~m} / \mathrm{s} \). The combined mass of the astronaut and pistol is \( 85 \mathrm{~kg} \). How fast and in what direction is the astronaut moving after…
1- Find center of mass of a triangular plate the lengths of sides of which are 8 cm, 8 cm and 5 cm. please explain all steps!!
That average net force is required to bring a 700 kg car to rest from a speed of 65 km/hr in 30s?
Two particles, with masses m1 = 2.00 kg and m2 = 8.00 kg, are joined by a light rod of length L = 2.50 m. A force F = 15 N is applied to m1, perpendicular to the rod. a) Locate the centre of mass (“CM”), and calculate the moment of inertia about the CM, and the angular acceleration. b) Find…
A crane lifts a 1000. kg load vertically 30.0 m at a constant velocity. What is the change in the load's gravitational potential energy?
Consider a manometer; which is an instrument used to measure pressure; which uses three different liquids for measurement: Water is colored in blue; mercury in silver/grey and oil is yellow/gold. Assuming that the gage pressure is P = 10[kPa] solve for the height d of the mercury on the…
\( \mathrm{~ M T B H - R T 6 1 : ~ H o p a t o w t a n . ~ P r o t r o ~ R o c a ~ m i m e ~ L o w s e s ~ a r ~ V a r e o r s ~ L o c a r n o w s} \) \( 5 \mathrm{Nx} \) is cotical Irictionlest pin. The fods are marked at half-mocter insovids Rank the mapnitude of the vartical force I applisd…
NTPC-RT19: HEXAGON-Tonoue anour Center Four foeces act os a plywood hesagon as shoun in the diapram. The sides of the hexagon each have a: length of l meler. Rank the magnitude of the toryue applicd abeut the ctnter of the hevagon by earh force. Grestest \( 1 \ldots 4 \) Leasl OR, The magnitude…
\( \mathrm{~ I n ~ e a c h ~ c a s e ~ b e l o w , ~ i s ~ w o o l e s ~ b o u r d ~ s e p p o w ~ c o t e ~ o f ~ r a p ~ b o c e s . ~ T u e ~ b o a n d} \) \( \mathrm{~ R c a n k ~ t h e s e ~ n a t u a t i k n ~ e s ~ t h e ~ b u r k ~ o f ~ i t w e ~} \) dievetiy above the left…