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A dragonfly is clocked at 2.0 m/s, North at one moment, and then 2.0 seconds later, the dragonfly appears to be going approximately 3.5 m/s, West. In that 2-second interval, what is the average acc
The electric force between two electrons with a distance of 0.87 m between them is repulsive. Calculate the electric force between these two electrons.
estimate the standard deviation of the number of counts obtained in 1 hr
Determine the relative humidity if the vapor pressure is 6mb and the saturation vapor pressure is 24mb. Determine the relative humidity if the vapor pressure is 12mb and the saturation vapor pressure
Draw what happens to parallel light that enters two lenses such that the two lenses (both with positive focal lengths) are separated by the sum of their focal lengths (f1+f2).
A piece of copper wire has a resistance per unit length of6.1510-3?/m. The wire is wound into a thin, flat coil of many turns that has a radius of0.180m. The ends of the wire are connected to a 12.
A 106.0 N grocery cart is pushed 13.0 m along an aisle by a shopper who exerts a constant horizontal force of 40.0 N. If all frictional forces are neglected and the cart starts from rest, what is t
The upper surface of a cube of gelatin, 7.0 cm on a side, is displaced 0.78 cm by a tangential force. If the shear modulus of the gelatin is 950 Pa, what is the magnitude of the tangential force? A
If the bullet-block system compresses the spring by a maximum of 90.0 cm, what was the speed of the bullet at impact with the block?
A proton of energy 4MeV scatters off a second proton at rest. One proton comes off at an angle of 300 in the lab system. What is its energy? What is the energy and scattering angle of the second pr
Notice a jogger approaching. If thejogger is running at a speed of 2.50m/s, how fast is her image moving when she is 10m away?
Solar radiation enters a narrow, rectangular, east-west canyon at noon. The valley is 100m wide and the sides of the canyon are 100m tall.
An air-filled toroidal solenoid has a mean radius of 20.0 and a cross-sectional area of 7.00 . When the current is 11.0 , the energy stored is 0.450. How many turns does the winding have?
You hold a brick at rest in your hand. (a) How many forces act on the brick? (b) Identify these forces. (c) Are these forces equal in magnitude and opposite in direction? (d) Are these forces an ac
What is the probability that technician B in an independent 5 minute measurement would obtain a value as close, or closer, to the true count rate as technician A.
You want to throw a 0.145 kg baseball with a speed of of 144 km/hr. To achieve that, you swing your hand so that the displacement of the ball is 2.20 m and release it. Assuming that the force durin
A 31 kg child slides down along an inclined slide that makes an angle 35o with the horizontal. If the length of the slide is 15 m and the speed of the child is 5.5 m/s at the bottom of the slide, w
A 30.00 kg kid crawls up a 12.00 meters long slide inclined at an angle of 30.00 degrees above the horizontal. What is the change in gravitational potential energy of the child
A shop sign weighing 255 N is supported by a uniform 125 N beam as shown in Fig. 9-54. Find the tension in the guy wire. Find the horizontal and vertical forces exerted by the hinge on the beam.
A string tied to a sled makes an angle of 60° to the vertical when you are pulling it on an icy frictionless horizontal surface. If the tension in the string is 40.0 N, calculate the work done
If the Earth's magnetic field has magnitude 0.44 m T and is directed 65 degrees below the horizontal, what is the magnetic flux through the desk surface?
An AC generator has 95 rectangular loops on its armature. Each loop is 11 cm long and 8 cm wide. The armature rotates at 1100 rpm about an axis parallel to the long side. If the loop rotates in a u
A grinding wheel is a uniform cylinder with a radius of 7.70cm and a mass of 0.500kg. Calculate its moment of inertia about its center.
A cylindrical cable with 2.53 x 10-8 m resistivity carries a current of 1300 A. There is a potential difference of 1.9 x 10-2 V between two points on the cable that are 0.24 m apart. What is the ra
An electric power station is producing 1.6 x 10^+3 W of power that is to be sent to a small town located 12 km away. Each of the two wires that comprise the transmission line has a resistance per k