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What is the magnitude of the net torque exerted on the branch by the children? Assume that the axis is located where the branch joins the tree trunk and is perpendicular to the plane formed by the b
The punter on a football team tries to kick a football so that it stays in the air for a long "hang time." If the ball is kicked with an initial velocity of 23.6 m/s at an angle of 61.5° above t
The magnitude of the shopper's displacement from the bottom of the escalator to the store is 16.0 m. The vertical distance between the floors is 6.31 m. At what angle is the escalator inclined above
Assuming that features you see on Mars are similar to features found on Earth, what would a casual inspection of the interactive photo of Mars lead you to suspect about water on Mars?
A 0.18-kg ball is placed in a shallow wedge with an opening angle of 118°.. For each contact point between the wedge and the ball, determine the force exerted on the ball (There are two contact
A planet orbits a star once every 2.90 x 10^7 s in a nearly circular orbit of radius 1.66 x 10^11 m. With respect to the star, determine the tangential speed of the planet.
In 9.4 s a fisherman winds 2.2 m of fishing line onto a reel whose radius is 3.0 cm (assumed to be constant as an approximation). The line is being reeled in at a constant speed. Determine the angul
Consider two people, one on the earth's surface at the equator and the other at the north pole. Which has the larger centripetal acceleration?
The speeds of the electrons are quite large, and for accurate calculations of the speeds, the effects of special relativity must be taken into account. Ignoring such effects, find the electron speed
You hear a fire truck's siren change frequency from 476 Hz to 404 Hz as the truck approaches,passes by and moves away. Taking the speed of sound in air to be 343m/s, find the speed of the truck.
Two particles are fixed to an x axis: particle 1 of charge q1 = +1.3 10-8 C at x = 20 cm and particle 2 of charge q2 = -4.50q1 at x = 70 cm. At what coordinate on the axis is the net electric field
The first three harmonics of an organ pipe have frequencies 126 Hz, 378 Hz and 630 Hz. (a) Is this an open-open or an open-closed pipe? (b) If the speed of sound in air is 240m/s, what is the length
If the circle lies in a uniform magnetic field of magnitude B = 7.09 mT, what is the maximum possible magnitude of the torque produced on the loop by the field?
Calculate the energy and wavelength of the transition from the 5s orbital to the 3pz orbital
If the car was initially traveling at 86 km/h and came to a stop in 5.6 s along a straight, level road, what was the magnitude of the average force applied to the passenger by the seatbelt?
(a) What is the maximum static friction force on the bureau (before it begins to move)? (b) What is the acceleration of the bureau once it is in motion?
Natural uranium metal contains 99.3% Uranium-238. Its density is 19.05 g/cm^3. Consider a neutron of energy 2 KeV passing through this metal. a). What is the most likely fate of such a neutron? Spec
A 6 μf capacitor is initially charged to 100 V and then connected across a 600 Ω resistor. a) what is the initial charge on the capacitor? b) what is the initial current just after the capaci
A bricklayer applies a force of 100 N to each of two handles of a wheelbarrow. Its mass is 20 kg and it is loaded with 30 bricks, each of mass 1.5 kg. The handels of the wheelbarrow are 30 degrees f
The bureau initially moves along the floor in the same general direction as you pull. (a) What is the maximum static friction force on the bureau (before it begins to move)?
A family ice show is held in an enclosed arena. The skaters perform to music playing at a level of 82.0 dB. This intensity level is too loud for your baby, who yells at 72.0 dB. (a) What total sound
A projectile with mass of 533 kg is launched straight up from the Earth's surface with an initial speed vi. What magnitude of vi enables the projectile to just reach a maximum height of 4.6RE, measu
You have been asked to design a "ballistic spring system" to measure the speed of bullets. A spring whose spring constant is k is suspended from the ceiling. A block of mass M hangs from the spring.
The passengers in a roller coaster car feel 60% heavier than their true weight as the car goes through a dip with a 24 m radius of curvature. What is the car's speed at the bottom of the dip?
What must the charge (sign and magnitude) of a particle of mass 1.50 g be for it to remain stationary when placed in a downward-directed electric field of magnitude 600 N/C?