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A car starts from rest and travels for 5.0 s with a uniform acceleration of +1.5m/s2. the driver then applies the brakes, causing a uniform acceleration of -2.1 m/s2. if the brakes are applied for 3
Two packing crates of masses m1 = 10.0 kg and m2 = 5.50 kg are connected by a light string that passes over a frictionless pulley as in the figure below. The 5.50 kg crate lies on a smooth incline o
The longest recorded pass in an NFL game traveled 81 yards in the air from the quarterback to the receiver.Assuming that the pass was thrown at the optimal 45 angle, what was the speed at which the
A copper-bottomed kettle, its bottom 24 in diameter and 3.0 thick, sits on a burner. The kettle holds boiling water, and energy flows into the water from the kettle bottom at 800. What is the tempe
Two crewman pull a raft through a lock, one crewman pulls with a force of 130 newtons at an angle of 34 degrees, the other pulls pulls at an angle of 45 degrees, with what force must the second crew
An electric motor rotating a workshop grinding wheel at a rate of 85 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 2.20 rad/s2
A wooden rod of negligible mass and length 82.0 is pivoted about a horizontal axis through its center. A white rat with mass 0.550 clings to one end of the stick, and a mouse with mass 0.170 clings
A potter's wheel having a radius 0.55 m and a moment of inertia 13.3 kg·m2 is rotating freely at 50 rev/min. The potter can stop the wheel in 4.5 s by pressing a wet rag against the rim and e
A football player runs the pattern given in the drawing by the three displacement vectors , , and . The magnitudes of these vectors are A = 5 m, B = 20.0 m, and C = 25.0 m. Using the component metho
A 28-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 180 J from 440 J. How high does she rise during this
A horizontal pipe contains water at a pressure of 124 kPa flowing with a speed of 2.4 m/s. The pipe narrows to one-half its original diameter. What are the speed and the pressure of the water when t
Some electric-power companies use water to store energy. Water is pumped by reversible turbine pumps from a low to a high reservoir.
A baseball is hit with a speed of 28.0 at an angle of 41.0. It lands on the flat roof of a 12.0 -tall nearby building. If the ball was hit when it was 1.5 above the ground, what horizontal distance
A horizontal pipe contains water at a pressure of 118 kPa flowing with a speed of 1.8 m/s. The pipe narrows to one-half its original diameter. What are the speed and the pressure of the water when
A chair of weight 125 N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 45.0 N directed at an angle of 38.0^circ below the horizontal and the
A ball of mass 3 kg is thrown straight up in the earth's gravitational field with an initial speed v0 = 19 m/s. What is the speed of the ball at a height h = 1.9 m?
Three equal point charges, each with charge 1.90 , are placed at the vertices of an equilateral triangle whose sides are of length 0.400 . What is the electric potential energy of the system? (Take
A 38.0 cm diameter loop is rotated in a uniform electric field until the position of maximum electric flux is found. The flux in this position is 5.20 105 N·m2/C. What is the magnitude of the
An electric motor rotating a workshop grinding wheel at a rate of 99 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 2.30 rad/s2. (a) How long doe
A short time later when the student returns, the temperature has risen to 97.5 °C. The coefficient of volume expansion of coffee is the same as that of water. How much coffee (in cubic meters) h
After the block is released from rest it travels upward and then leaves the spring. To what maximum height above the point of release does it rise?
The second car starts from rest and has a constant acceleration. What acceleration must it maintain, so that the two cars meet for the first time at the next exit, which is 1.69 km away?
Neglecting all resistive forces, determine the spring constant.Neglecting all resistive forces, determine the speed of the projectile as it moves through the equilibrium position of the spring (whe
A ranger in a national park is driving at 31 km/h when a deer jumps onto the road 63 m ahead of the vehicle. After a reaction time of t s, the ranger applies the brakes to produce an acceleration of