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A force of 250 N exerted at an angle of 30° above the horizontal is needed to keep a 90 kg block moving along a
cement floor. Find the coefficient of kinetic friction.
Alyssa dropped the golf ball from the 5th floor of the hotel and hits the ground for 5 seconds later. How tall is a 5th floor hotel?
Two spherical objects have masses of 7.5 x 108 kg and 6.5 x 108 kg. Their centers are separated by a distance of 2.5 x 106 m.
The resting potential of the crab limb nerve is 89 mV. What is the
concentration of potassium ions inside the nerve, if it is 12mmol/1 outside?
Take the temperature equal to 20°C
The resting potential of the crab limb nerve is 89 mV. What is the
concentration of potassium ions inside the nerve, if it is 12mmol/1 outside?
Take the temperature equal to 20°C
What is the total electric flux through a closed surface containing a 2.0 μC charge?
A girl sits at a distance of 12.0 m from the axis of merry-go-round in an amusement park. If the merry-go-round makes 3 rev
in 12 Os find the (a) tangential speed and (b) centripetal acceleration of the child.
A child sits at a distance of 5.0 m from the axis of merry-go-round in an amusement park. If the merry-go-round makes 2 rev
in 10.0s, find the (a) tangential speed and (b) centripetal acceleration of the child.
A car 2000kg tied to the rope of 15m whose end is located at the center. If the car is moving at the rate of 8 m/s. Calculate the centripetal force acting on it?
Two spherical objects have masses of 66g and 35 g. The gravitational attraction between them is 6.5 x 10-3 N. How far apart are their centers?
