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The acceleration of gravity is 9.81 m/s2 . If the coefficient of kinetic friction between the box and ramp is 0.28, calculate the change in the box's kinetic energy.
A 300 m tall-tower is built on the equator. How much faster does a point at the top of the tower move faster than a point at the bottom? The radius of the Earth is 6400000m.
The first displacement is 4.00 m westward, and the second is 10.0 m northward. Use the graphical method to find the magnitude and direction of the third displacement.
Secretariat ran the 1.25 mi long Kentucky Derby with times of 25.4 s, 24.4 s, 23.7 s, 23.2 s, and 23.5 s for each of the quarter mile segments. (a) Find his average speed during each quarter-mile se
If the bowls are in an equilateral triangle (with sides 0.50 m) what is the magnitude of the net force on Baby Bear's bowl?
A train traveling at a constant speed rounds a curve radius 275 meters. A chandelier suspended from the ceiling swings out to an angle of 17.5 degrees from the normal throughout the turn. What is th
A cart is propelled over an xy plane with acceleration components ax = 5.5 m/s2 and ay = -2.0 m/s2. Its initial velocity has components v0x = 8.0 m/s and v0y = 12 m/s. In unit-vector notation, what
After landing, a jetliner on a straight runway taxis to a stop at an average velocity of -35.0 . If the plane takes 7.00 to come to rest, what are the plane's initial velocity and acceleration?
A standing wave that corresponds to the fourth harmonic is set up on a string that is fixed at both ends. If the frequency of this standing wave is 440 HZ what is the frequency of the lowest-frequen
Now it is found that the objects repel one another with a force whose magnitude is equal to that of the initial attractive force. What is the initial charge on each object? (Note: there are two poss
Two small objects, A and B, are fixed in place and separated by 3.03 cm in a vacuum. Object A has a charge of +2.04 µC, and object B has a charge of -2.04 µC. How many electrons must be
Consider two planes separated by 10m, one with a charge of +5c/m^2 and the other -5c/m^2. what is the magnitude of the electric field between the two planes at a point 2m from the negative plane? wh
Over a time interval of 1.83 years, the velocity of a planet orbiting a distant star reverses direction, changing from +20.2 km/s to -17.1 km/s. Find the following values, include the correct algebr
A fire hose ejects a stream of water at an angle of 32.8 degrees above the horizontal. The water leaves the nozzle with a speed of 29.6m/s. Assuming that the water behaves like a projectile, how far
An infinite plane has a surface charge of -5c/m^2. what is the magnitude of the electric field 3 meters from the plane? what is the direction of the electric field (toward or away) from the plane?
A bat flies toward a wall, emitting a steady sound with a frequency of 24.0 . This bat hears its own sound plus the sound reflected by the wall. How fast should the bat fly, to hear a beat frequency
Where does the swimmer reach the other shore if he always swims perpendicular to the velocity of the water?
An electric field is constant at every point on a square surface that is 0.80 m on a side. This field has a magnitude of 4.3 N/C and is oriented at an angle of 35° with respect to the surface, a
The density and Young's modulus of this metal are, respectively, 7800 kg/m3 and 4.3 x 1010 N/m2. What is the frequency of the rod's vibration?
(a) If the radius of the Gaussian surface were doubled, how much flux would pass through the surface? (b) What is the value of the point charge?
Suppose a parallel plate capacitor (with capacitance C1) is fully charged (to a value Qo) by a battery. The battery (which supplies a potential difference of Vo) is then disconnected. If the plates
The man starts across, rowing steadily at 0.75 m/s and reaches the other side of the river at point C, 150 m downstream from his starting point. While the man is crossing the river, what is his velo
A small, negatively charged particle has a charge of 1.33e-6 C and a mass of 8 mg. It moves from point A, where the electric potential is 151 V, to point B, where the electric potential is 50 V grea
A basketball player, standing near the basket to grab a rebound, jumps 72.4 cm vertically. How much time does the player spend in the top 15.3 cm of his jump?