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Mechanics | Relativity
You are explaining to friends why an astronaut feels weightless orbiting in the space shuttle, and they respond that they thought gravity was just a lot weaker up there.
Convince them that it isn't so by calculating how much weaker (in %) gravity is 440 km above the Earth's surface.
Express your answer using three significant figures.
Convince them that it isn't so by calculating how much weaker (in %) gravity is 440 km above the Earth's surface.
Express your answer using three significant figures.
Mechanics | Relativity
If a curve with a radius of 93 m is properly banked for a car traveling 69 km/h, what must be the coefficient of static friction for a car not to skid when traveling at 88 km/h?
Express your answer using two significant figures.
Express your answer using two significant figures.
Mechanics | Relativity
A curve of radius 75 m is banked for a design speed of 75 km/h.
If the coefficient of static friction is 0.37 (wet pavement), at what range of speeds can a car safely make the curve? [Hint: Consider the direction of the friction force when the car goes too slow or too fast.]
Express your answers using two significant figures separated by a comma.
If the coefficient of static friction is 0.37 (wet pavement), at what range of speeds can a car safely make the curve? [Hint: Consider the direction of the friction force when the car goes too slow or too fast.]
Express your answers using two significant figures separated by a comma.
Mechanics | Relativity
An object is thrown upward from point A with a velocity of 40ms-1 calculate the time it takes to return to point A
Mechanics | Relativity
A ball throw vertically upward from groud level hits the ground after 4.0s.calculate the maximum height it reached during the journey.
Mechanics | Relativity
Define speed, velocity and acceleration
Mechanics | Relativity
find the angle of projection at which the horizontal range is twice the maximum height of the projectile
Mechanics | Relativity
A rectangular waterlight box is 560mm long , 420mm wide and 210 mm deep.It weighs 223N.
a) if it floats with its sides and ends vertical in water of density 1030 kgm-3, what dept of the box will be submerged?
b) if the box is held completely submerged in water of the same density, by a vertical chain attached to the underside of the box, what is the force in the chain?
a) if it floats with its sides and ends vertical in water of density 1030 kgm-3, what dept of the box will be submerged?
b) if the box is held completely submerged in water of the same density, by a vertical chain attached to the underside of the box, what is the force in the chain?
Mechanics | Relativity
a cable car of a mass 12 kg. is parked on a slope of 20° compressing a giant retaining spring to a length of 0.75m. if the spring constant is 2.0×10⁴n/m. what is the length of the spring when relaxed? neglect friction
Mechanics | Relativity
A 1000 kg truck is parked on a bridge 100 m long at a distance of 25 m from one end of
the bridge. The mass of the bridge is 200 kg m−1
. Calculate the reaction forces at the
supports at the two ends of the bridge. (Take g = 10 ms−2
)
the bridge. The mass of the bridge is 200 kg m−1
. Calculate the reaction forces at the
supports at the two ends of the bridge. (Take g = 10 ms−2
)
