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A baseball is hit so that it travels straight upward after being struck by the bat. A fan observes that it takes 2.80 s for the ball to reach its maximum height. Find the ball's initial velocity
A placekicker must kick a football from a point 36.0 m (about 40 yards) from the goal. By how much does the ball clear or fall short of clearing the crossbar
An athlete swings a ball, connected to the end of a chain, in a horizontal circle. Which rate of rotation gives the greater speed for the ball
An electron with kinetic energy 1.36 keV circles in a plane perpendicular to a uniform magnetic field. The orbit radius is 24.0 cm. Find the frequency of circling
The athlete shown in the figure rotates a 1.00 kg discus along a circular path of radius 1.07 m. find the magnitude of the maximum radial acceleration of the discus
A 1.36 103-kg car traveling initially with a speed of 20.0 m/s in an easterly direction crashes into the rear end of a 9.00 103-kg truck moving in the same direction at 15.0 m/s. How much mechanic
a golf ball is shot from a tee, elevated above 20.0m above the green,with the initial angle of 50.0 degrees above the horizontal. how much time will it take for the ball to travel from the tee
A 4.19-kg ball of clay is thrown downward from a height of 2.79 m with a speed of 4.21 m/s onto a spring with k = 1490 N/m. Find the maximum compression of the spring
A 20-cm-radius ball is uniformly charge to 80nC. What is the ball's volume charge density and How much charge is enclosed by spheres of radii 5, 10 and 20 cm
A 100kg box slides down a ramp that has 60.0degrees slope. The coefficient of kinetic friction between the box and the ramp is 0.250. What is the work done by the gravitational force
The Earth can produce the downward electric field of 150 N/C around its surface. Assume this electric field is uniform through the atmosphere. Estimate the net charge of the Earth
You pour 108 cm3 of ethanol, at a temperature of -10.0?C, into a graduated cylinder initially at 20.0 ?C, filling it to the very top. What will be the final temperature of the ethanol
A 6.0 kg object undergoes an acceleration of 1.9 m/s2. Calculate the magnitude of the resultant force acting on the object
A small button placed on a horizontal rotating platform with diameter 0.326m will revolve with the platform when it is brought up to a rotational speed of 43.0rev/min, How far from the axis can the
A small block of mass 20.0 grams is moving to the right on a horizontal frictionless surface with a speed of 0.68 m/s. What is the speed of the 40.0 gram block after the collision
A coffee-maker (19 ?) and a toaster (13 ?) are connected in parallel to the same 120-V outlet in a kitchen. How much total power is supplied to the two appliances
Two capacitors C1 = 5.6 ?F, C2 = 13.7 ?F are charged individually to V1 = 16.4 V, V2 = 6.1 V. Calculate the final potential difference across the plates of the capacitors once they are connected
A heavy sled is being pulled by two people as shown in the figure. The coefficient of static friction between the sled and the ground is ?s = 0.595, what is the sled\'s acceleration
If a dielectric material with ? = 3.80 is inserted so that it fills the volume between the plates (with the capacitor still connected to the battery), how much additional charge will flow from the b
A crate of mass 45.0 kg is being transported on the flatbed of a pickup truck. The truck accelerates forward on level ground. What is the maximum acceleration the truck can have
A group of students need to cross a river in the shortest time. In what direction should the students head the boat
The atmospheric density at an altitude of 2500 km is about 1 molecule/cm3. find the mean free path predicted by the equation below
A 67kg man's arm, including the hand, can be modeled as a 70cm -long uniform cylinder with a mass of 3.5kg. by how much does he raise his center of gravity
Dave needs to get groceries from the store, which is a distance D = 1.1km east of his house. How long in seconds does it take dave to reach the store
A scooter begins at rest at t0 = 0 seconds. The scooter then accelerates and covers a distance d = 526 m, What is the scooters average speed during this period