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(a) What is the magnitude of the force that each sphere experiences? (b) The spheres are brought into contact and then separated to a distance of 3.51 cm. Determine the magnitude of the force that e
Find the work that must be done to increase the speed of the particle of mass 1kg from 2m/s to 6m/s over the distance of 10m. A constant friction force f=2N acts over the entire distance.
A sled with a child sliding down (from rest) at 14 degree hill has a mass of m=120kg. The length of the hill is 60 m and coefficient of kinetic friction between the surface ad the sled is .14. Once
Calculate the final equilibrium temperature assuming no heat loss after mixing occurs. Equilibrium temperature after initial heat loss: (answer in Celsius)
At a certain time a particle had a speed of 20 m/s in the positive x direction, and 2.2 s later its speed was 30 m/s in the opposite direction. What is the magnitude of the average acceleration of
Two point charges of equal magnitude are 7.8 cm apart. At the midpoint of the line connecting them, their combined electric field has a magnitude of 47 N/C . Find the magnitude of the charges q= __
A charge (uniform linear density = 9.4 nC/m) lies on a string that is stretched along an x axis from x = 0 to x = 3.0 m. Determine the magnitude of the electric field at x = 5.0 m on the x axis.
A disk of radius 1.2 cm has a surface charge density of 7.0 µC/m2 on its upper face. What is the magnitude of the electric field produced by the disk at a point on its central axis at distanc
The rock reaches a maximum height of 1.40×103m above the surface of the planet before it falls back down. What was the initial speed of the rock as it left the astronaut's hand? (Glob has no a
A 3.74 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=12.30 N at an angle theta=29.5 above the horizontal.(The force is being applied halfway up the b
A 65 g ice cube at 0°C is heated until 40 g has become water at 100°C and 25 g has become steam at 100°C. How much energy was added to accomplish the transformation?
When a driver brakes an automobile, the friction between the brake drums and the brake shoes converts the car's kinetic energy to thermal energy. If a 1400 kg automobile traveling at 35 m/s comes t
An aluminum cup contains 225 g of water and a 40 g copper stirrer, all at 27°C. A 420 g sample of silver at an initial temperature of 88°C is placed in the water. The stirrer is used to sti
what is the maximum temperature of the water at the bottom of the falls? Assume all the kinetic energy of the water as it reaches the bottom goes into raising the water's temperature.
How far does each bullet travel before the observer hears the report of the rifle? Assume that the bullets encounter no obstacles during this interval, and ignore both air resistance and the vertica
How much tensile stress is required to stretch this muscle by 5.2% of its length? If we model the tendon as a spring, what is its force constant? If a 75 kg sprinter exerts a force of 13.0 times his
The string has a linear mass density of 0.01 kg/m, and the tension in the string is supplied by a mass hanging from one end. If the string vibrates in its third harmonic, calculate the velocity of t
By what percent does the peak load impact of jogging compress the knee cartilage of a 72.0 kg person? What would be the percentage for a lower-impact activity, such as power walking, for which the p
You are on an airplane traveling 30° south of due west at 150.0 m/s with respect to the air. The air is moving with a speed 38.0 m/s with respect to the ground due north What is the heading of t
When the electron is 1.00x10^-10m from the alpha particle, it is moving directly away from the alpha particle at a speed of 3.00x10^6m/s. Calculate the distance between the electron and alpha partic
How far from a -7.20 uCpoint charge must a2.30 uCpoint charge be placed for the electric potential energy of the pair of charges to be -0.400J(Take U to be zero when the charges have infinite separ
The New River Gorge bridge in West Virginia is a 518 m long steel arch. How much will its length change between temperature extremes -23°C and 39°C?
Two particles have a mass of 20 kg and 150 kg respectively. If they are 800m apart, determine the force of gravity acting between them.