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A 31.0-kg child on a 1.00-m-long swing is released from rest when the ropes of the swing make an angle of 30.0° with the vertical.
(a) Neglecting friction, find the child's speed at the lowest position.Incorrect: Your answer is incorrect.Your response differs from the correct answer by more than 10%. Double check your calculations. m/s(b) If the actual speed of the child at the lowest position is 1.40 m/s, what is the mechanical energy lost due to friction?J
Joey, whose mass is 39kg, stands at rest at the outer edge of the frictionless 230kg merry-go-round, 2.2m from its center. What is the final angular speed of the merry-go-round
A 76 kg window cleaner uses a 13 kg ladder that is 5.0 m long. He places one end on the ground 3.0 m from a wall, What is the angle of this force on the ladder
Suppose the coefficient of static friction between the road and the tires on a car is 0.60 and the car has no negative lift. What speed will put the car on the verge of sliding
Only radiation with wavelengths smaller than 0.2424um is capable of dissociating molecular oxygen into atomic oxygen, according to the reaction: O2 + photon
Find out the magnitude of the truck's vertical component of displacement, answer in units of meters.
An average force of 270 N acts for a time interval of 0.04 s on a golf ball. What is the change in the golf ball's momentum
A 3.9 kg stone is tied to a 5.8 m long string and swung around a circle at a constant angular velocity 1.7 1/s. Find the magnitude of the torque about the origin
A diver springs upward with an initial speed of 1.9 m/s from a 4.0-m board. What is the highest point he reaches above the water
The inductance of a closely packed coil of 350 turns is 9.5 mH. Calculate the magnetic flux (per winding) through the coil when the current is 5.0 mA
A single mass m1 = 4.2 kg hangs from a spring in a motionless elevator. The spring is extended x = 13.0 cm from its unstretched length. What is the distance the upper spring is extended from its unstretched length
A tank of gasoline (n = 1.40) is open to the air (n = 1.00). A thin film of liquid floats on the gasoline and has a refractive index that is between 1.00 and 1.40. What is the refractive index of the film
At what driving frequency fd do two phasors have the same length? At that driving frequency, what are (c) the phase angle in degrees, (d) the angular speed at which the phasors rotate, and (e) the current amplitude?
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