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Three equal point charges, each with a charge of 2.00 mu C, are placed at the corners of an equilateral triangle whose sides have a length of 0.650 m. What is the potential energy of the system? (Ta
A baseball thrown at an angle of 55.0^circ above the horizontal strikes a building 18.0 {rm m} away at a point 8.00 {rm m} above the point from which it is thrown. Ignore air resistance. Find the ma
An object is thrown vertically up and attains an upward velocity of 33 m/s when it reaches one fourth of its maximum height above its launch point. what was initial speed of object?
Given that the focal length of the eyepiece is 2.58 cm, and the focal length of the objective is 0.465 cm, calculate the magnitude of the angle subtended by the red blood cell when viewed through th
A dock worker applies a constant horizontal force of 80.5 to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves 10.0 in the first 6
For the cyclist in this 30.0 s interval, what are the (a) magnitude and (b) direction of the displacement, the (c) magnitude and (d) direction of the average velocity, and the (e) magnitude and (f)
A hot-air balloon is rising straight up with a speed of 5.2 m/s. A ballast bag is released from rest relative to the balloon when it is 13.6 m above the ground. How much time elapses before the ball
A block of mass 0.24 kg is placed on a verti- cal spring of constant 6030 N/m and pushed downward, compressing the spring 0.09 m. After the block is released it leaves the spring and continues to tr
A light bulb is connected to a 120.0-V wall socket. The current in the bulb depends on the time t according to the relation I = (0.825 A) sin [(286 rad/s)t]. (a) What is the frequency of the alterna
A 2 kg block initially hangs at rest at the end of two 1-meter strings of negligible mass. A .003 kg bullet, moving horizontally with a speed of 1000 meters per second, strikes the block and becomes
A car starts from a rest and travels for 5s with a uniform acceleration of 1.5m/s2.the driver then applies the brakes,causing a uniform deceleration of 2.0m/s2.if the brakes are applies for 3.0s, wh
A 78 kg diver steps off a 14 m tower and drops from rest straight down into the water. If he comes to rest 4.4 m beneath the surface, determine the average resistance force exerted on him by the wat
A parallel plate has a capacitor of 8.6 mF with air between the plates. The capacitor is connected to a 32-V battery and charged. The battery is then removed.When a dielectric is placed between the
A chair of weight 90.0 lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of = 37.0 directed at an angle of 35.0below the horizontal and the chair slides
A hot-air balloon is descending at a rate of 1.5 when a passenger drops a camera.If the camera is 41 above the ground when it is dropped, how long does it take for the camera to reach the ground?
A car is traveling at 28 m/s when the driver spots a large pothole in the road a distance 25 m ahead. She immediately applies her brakes. If her acceleration is -6.9 m/s2, does she manage to stop be
A frictionless pulley with zero mass is attached to the ceiling, in a gravity field of 9.80 m/s2. Mass M2=0.100 kg is being accelerated downward with a=1.10 m/s2. Calculate the mass m1
An under damped harmonic oscillation has its amplitude reduced to 1/10thof its initial value after 100 oscillations. If its time period is 1.15s then calculate (i)damping constant (ii) relaxation ti
A tank having a volume of 0.100 m3 contains helium gas at 125 atm. How many balloons can the tank blow up if each filled balloon is a sphere 0.300 m in diameter at an absolute pressure of 1.10 atm?
A chair of weight 85.0 N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 36.0 N directed at an angle of 39.0 degrees below the horizontal and
One of the fastest recorded pitches in major-league baseball,thrown by Billy Wagner in 2003, was clocked at 101.0 mi/h. If a pitch were thrown horizontally with this velocity, how far would the ball
A child goes down a playground slide with an acceleration of 1.40. Find the coefficient of kinetic friction between the child and the slide if the slide is inclined at an angle of 26.0 deg below the
The pilot of an airplane traveling 230 km/h wants to drop supplies to flood victims isolated on a patch of land 200 m below.The supplies should be dropped how many seconds before the plane is direct
A string that is under 49.0 of tension has linear density 5.00. A sinusoidal wave with amplitude 2.50 and wavelength 2.20 travels along the string. What is the maximum velocity of a particle on the
A model airplane traveling with a constant speed of 11.0m/s east then accelerates to the east at a rate of 2.35 m/s per second. The airplane hass a mass of 3.12 kg. What net force is required to pro