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The earth is 4times the size of the moon and acceleration due to gravity of the earth is 80times that of the moon. Calculate the ratio of the mass of the moon to that of the earth.
Two parallel plates at a distance of 0.008m apart are maintained at a potential difference of 600v with the negative plate earthed, calculate the electric field strength around the plates.
FIVE FORCES ARE ACTING ON AN OBJECT: 1) F1 - 25 N EAST 2) F2 - 30 N 20 DEGREES NORTH OF WEST 3) F3 35 N 25 DEGREES SO0UTH OF WEST 4) F4 - 40 N SOUTH AND 5) F5 - 45 N 35 DEGREES SOUTH OF EAST FIND:
THE X AND Y COMPONENTS OF F1
Two charged concentric spheres have radii of 10cm and 18cm.the charge on the inner sphere is 6.0×10^8c and that on the outer sphere is 2.0×10^-8c.find the electric field at r=12cm
The speed of a projectile when it reaches its maximum height is 0.38 times its speed when it is at half its maximum height.What is the initial projection angle of the projectile?
Children playing in a playground on the flat roof of a city school lose their ball to the parking lot.One of the teachers kicks the ball back up to the children.The playground is 5.70m above the parking lot,and the school building's vertical wall is h=6.80m high, forming a 1.10m high railing around the playground.The ball is launched at an angle of 53.0° above the horizontal at a point d=24.0m from the base of the building wall.The ball takes 2.20s to reach a point vertically above the wall.
(a).Find the speed (in m/s) at which the ball was launched .
(b).Find the vertical distance (in m)by which the ball clears the wall.
(c).Find the horizontal distance (in m)from the wall to the point on the roof where the ball lands.
A rubber toy duck is at rest on an inclined plane.When the angle of inclination of the plane is increased to 35.4°C,the toy duck begins to slide down the incline.Then,when the angle is decreased to 29.8°C,the speed of the toy duck is constant.What are the coefficients of static and kinetic friction between the toy duck and the incline.
The four particles are connected by rigid rods of negligible mass where y1=5.90m.The origin is at the centre of the rectangle.The system rotates in the xy plane about the z axis with an angular speed of 6.60 rad/s.
(a). Calculate the moment of inertia of the system about the z axis.
(b). Calculate the rotational kinetic energy of the system.
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A 1.5-kg
kg block rests on top of a 7.5-kg
kg block. The cord and pulley have negligible mass, and there is no significant friction anywhere.
a)What force F
F must be applied to the bottom block so the top block accelerates to the right at 2.2 m/s
2
m/s2 ?
b)What is the tension in the connecting cord?
A person jumps from the roof of a house 3.9-m
m high. When he strikes the ground below, he bends his knees so that his torso decelerates over an approximate distance of 0.75 m
m .
a)If the mass of his torso (excluding legs) is 45 kg
kg , find his velocity just before his feet strike the ground.
b)If the mass of his torso (excluding legs) is 45 kg
kg , find the magnitude of the average force exerted on his torso by his legs during deceleration.
c)What is the direction of this force? upward or downward
