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Q1. To give a 19kg child a ride, two teenagers pull on a 4kg sled with ropes, as indicated in the figure. Both teenagers pull with a force of F = 55N at the angle of 35° relative to the forward direction, which is the direction of motion. In adding, the snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. Find out the acceleration of the sled and child.
Q2. A nursing mother puts her baby to her breast every time she hears it cry. After a few days, her milk starts to flow once she hears the baby cry. In terms of classical conditioning, what is the conditioned stimulus?
3.00 m-long, 350 steel beams extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 66.0 construction worker stands at the far end of beam.
What is moment of inertia
How much time is necessary to catch the car
What is the caused by sun wind in upper atmosphere
An object weighs 302 N in the air. When tied to a string, connected to a balance, and immersed in water, it weighs 220 N. When it is immersed in oil, it weighs 257 N. what is the density of the object.
What happens to support force on the workmens feet
An object at rest explodes into three pieces of equal masses. One moves east at 23 m/s, while the second piece moves northwest at 14 meter per second. Find the velocity of the third piece?
What would be the potential difference VC - VB across the thin resistor if the battery emf is 4.00 volts? Suppose that the electric field in the thick wires is very small (so that the potential differences along the thick wires are negligible)
An electric force of 4.0 N exists between two objects separated from each other by a distance of r. If the distance is decreased to 0.50 r, compute the magnitude of the force between the two objects.
A 92 kg man standing on a surface of negligible friction shoves a 73 g stone lying at his feet, giving it a velocity of 4.0 m/s. What velocity does the man acquire as a result.
What must be the temperature of the cold reservoir in order to increase the efficiency to 29.0%
Travelling at a speed of 17.10 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.740. What is the speed of the automobile after 1.81 s have el..
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