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A 24-kg wagon accelerates on a horizontal surface at 0.7 m/s2 when pulled by a rope exerting a 120-N force on the wagon at an angle of 25o above the horizontal. Determine the magnitude of the effective friction force exerted on the wagon Express your answer to two significant figures and include the appropriate units. Determine the effective coefficient of friction associated with this force. Express your answer to two significant figures.
A jogger runs directly east for 5 km, then turns and goes northwest for 5 km. He then travels directly south for 3 km. How far is he from the starting point
An 8-kg ball hanging from the ceiling by a light wire 135cm long is struck in an elastic collision by a 2 kg ball moving horizontally at 5.00 m/s just before the collision. Find the tension in the wire just after collision.
The technique known as potassium-argon dating is used to date old lava flows. The potassium isotope 40K has a 1.28 billion year half-life, What is the age of the rock
a runner accelerates to a velocity of 5.30 ms due west in 3 s. his average acceleration is 0.643 ms2 also directed due
A block is suspended from a string connected to a balance. While in air, the scale reads 350 N. What is the buoyancy force on the object when immersed in water
A ship is traveling east at 36.0 km/hr. A small boat is also traveling east at 4.05 m/s. What is the whale's velocity relative to the ship's inertial frame
A chest x ray uses 10 keV photons with an RBE of 0.85. A 60 kg person receives a 0.30 mSv dose from one chest x ray that exposes 25% of the patient's body. How many x ray photons are absorbed in the patient's body
An airplane flying directly eastward at a constant rate travels 305 km in 2.0 h. What is the average velocity of the plane
Suppose a test pilot is able to safely withstand an acceleration of up to 5.0 times the acceleration due to gravity. What is the radius of the smallest circle in which he will be able to safely fly the plane
Why is it better for some purposes to use a medium size telescope on a mountain instead of a telescope in space?
a mass less vertical spring is displaced 0.15 m when a 3.25 kg mass is attached. when used horizontally what is the
An object placed 11.00 cm from a concave spherical mirror produces a real image 8.40 cm from the mirror. If the object is moved to a new position 20.0 cm from the mirror, what is the position of the image?
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