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(a) Draw a free-body diagram of yourself. (Do this on paper. Your instructor may ask you to turn in this work.) (b) Use this diagram with Newton's laws to determine the force of friction on you.
A 4.6-kg block slides down an inclined plane that makes an angle of 31° with the horizontal. Starting from rest, the block slides a distance of 2.1 m in 5.3 s. Find the coefficient of kinetic fr
A concave mirror with a radius of curvature of 1.4 m is illuminated by a candle located on the symmetry axis 3.4 m from the mirror. Where is the image of the candle? Answer in units of m.
Assume its latent heat of evaporation at 37 degrees C is the same as its heat of vaporization at 100 degrees C. Calculate the rate at which you lose energy by exhaling humid air.
An idiot is having a uniform displacement around a circular track of radius 10 m , what will ne his displacement from the starting pint at 3 min and 30 seconds, giving that in 60 sec he covers one f
If the salmon is able to jump vertically upward from the base of the fall, what is the maximum height of the water fall that the salmon can clear?
A police car is moving at 36.7 m/s (82.1 mi/h) behind a speeding car that is going faster. The speed limit is 29.1 m/s (65.0 mi/h). A police car radar "clocks" the speed of the other car by emitting
A heavy drape, hung close to a cold window, reduces heat loss considerably by interfering with heat transfer. Which heat transfer process would be most affected by the drape and why?
A satellite circles the earth in a circular orbit of radius of R where R is the distance from the center of the earth. A second identical satellite circles in an orbit that is at twice the distance
The intensity of the sunlight that reaches Earth's upper atmosphere is approximately 1330 W/m2. (a) What is the total average power output of the Sun, assuming it to be an isotropic source?
(a) What is the time constant of the circuit? (b) What is the potential difference (in V) across the capacitor at t = 19.0 s?
When, according to the clock attached to the nose of the spaceship, is the signal received?
Three resistors all have resistance 30 W . What are the largest and smallest equivalent resistances that can be created with these three resistors?
The girl pushes the boy hard, sending him backward with a velocity 2.10 m/s toward the west. Ignore friction. How much potential energy in the girl's body is converted into mechanical energy of the
A 0.405-µF capacitor is connected across the terminals of a variable frequency oscillator. (a) What is the frequency when the reactance is 5.88 kO?
(a) Find the common speed the two gliders have when the spring is at maximum compression. (b) Find the maximum spring compression distance.
The object is pulled down an additional 15.5 cm and released from rest to oscillate without friction. What is its position x at a moment 84.4 s later? Find the distance traveled by the vibrating obj
A variable capacitor with negligible resistance is connected to an ac voltage source. By what factor does the current in the circuit increase if the capacitance is increased by a factor of 6.0 and t
The astronaut is strapped into a seat 4.00 m from the axis. What is the astronaut's tangential acceleration during the first 40.0 s?
The 4.0 V battery is then disconnected and replaced with a 5.0 V battery, with the positive and negative terminals connected in the same manner as before. How much additional charge flows to the pos
A charged belt, 35 cm wide, travels at 40 m/s between a source of charge and a sphere. The belt carries charge into the sphere at a rate corresponding to 100 µA. Compute the surface charge den
Two oppositely charged parallel plates with an electric field of 80 V/m have potential difference of 40 V. A tiny sphere of mass 50 mg with 2120 excess electrons is placed in the field and sits on t
A block of iron absorbs 5,400 joules of heat. If the temperature increases from 22 C to 32 C, what is the mass of the block? The specific heat of iron is 450 J/kg degrees celsius.
A real battery has emf ε= 50.0 V. When it is connected to a 20.0-Ω resistor, the current is 2.45 A. What are the internal resistance of the battery and the potential differnce between