Recent questions in Physics

Secondary
Answered

emancipezN
2020-11-23

A ski tow operates on a 15.0 degrees slope of lenth 300m. The rope moves at 12.0km/h and provides power for 50 riders at one time, with an average mass per rider of 70.0kg. Estimate the power required to operate the tow.

Secondary
Answered

Joni Kenny
2020-11-22

A 0.145 kg baseball pitched at 39.0 m/s is hit on a horizontal line drive straight back toward the pitcher at 52.0 m/s. If the contact time between bat and ball is $1.00\times {10}^{-3}$ s,calculate the average force between the bat and ball during contest.

Secondary
Answered

ddaeeric
2020-11-20

The drawing shows a version of the loop-the-loop trick for a small car. If the car is given an initial speed of 4 m/s, what is the largest value that the radius r can have if the car is to remain in contact with the circular track at all times?

Secondary
Answered

iohanetc
2020-11-16

A 500 g block is released from rest and slides down africtionless track that begins h = 1.80 m above the horizontal, as shown in Figure. At the bottom of the track, where the surface ishorizontal, the block strikes and sticks to a light spring with aspring constant of 25.0 N/m. Find themaximum distance the spring is compressed.

Secondary
Answered

Yasmin
2020-11-14

A spring of negligible mass stretches 3.00 cm from its relaxed length when a force of 8.50 N is applied. A 0.530-kg particle rests on a frictionless horizontal surface and is attached to the free end of the spring. The particle is displaced from the origin to x = 5.00 cm and released from rest at t = 0. (Assume that the direction of the initial displacement is positive.)

(a) What is the force constant of the spring? 280 N/m

(b) What are the angular frequency (?), the frequency, and the period of the motion?

? = 23.121 rad/s

f = 3.6817 Hz

T = 0.27161 s

(c) What is the total energy of the system? 0.35 J

(d) What is the amplitude of the motion? 5 cm

(e) What are the maximum velocity and the maximum acceleration of the particle?

$v}_{max}=1.1561\frac{m}{s$

$a}_{max}=26.73\frac{m}{{s}^{2}$

(f) Determine the displacement x of the particle from the equilibrium position at t = 0.500 s.

(g) Determine the velocity and acceleration of the particle when t = 0.500 s. (Indicate the direction with the sign of your answer.)

v = _________________ $\frac{m}{s}$

a = _________________ $\frac{m}{{s}^{2}}$

Secondary
Answered

Trent Carpenter
2020-11-11

Raindrops make an angle theta with the vertical when viewed through a moving train window. If the speed of the train is v (subscript t), what is the speed of the raindrops in the reference frame of the Earth in which they are assumed to fall vertically?

Secondary
Answered

Armorikam
2020-11-09

If a tank holds 5000 gallons of water, which drains from the bttomof the tank in 40 minutes, then torricelli's Law gives the volume Vof water remaining in the tank after t minutes $(1-{\frac{t}{40}}^{2})5000=V0\le t\le 40$.

Find the rate at which water is draining from the tank after (a) 5min, (b) 10 min. At what time is the water flowing out the fastest?the slowest?

Secondary
Answered

cistG
2020-11-09

A 7.0- g bullet is fired into a 1.5- kg ballistic pendulum.The bullet emerges from the block with a speed of 200 m/s, and theblock rises to a maximum height of 12 cm. Find the initial speed ofthe bullet.

Secondary
Answered

ankarskogC
2020-11-08

In an inkjet printer, letters are built up by squirting drops of ink horizontally at a sheet of paper from a rapidly moving nozzle. The Pattern on the paper is controlled by an electrostatic valve that determines at each nozzle position whether ink is squirted onto thepaper or not. The ink drops have a radius 15.0$\mu m$ and leave the nozzle and travel horizontally toward the paper at speed v=18.0 m/s . The drops pass through a charging unit that gives each drop a positive charge by causing it to lose some electrons. The drops then pass between parallel deflecting plates of length ${D}_{0}=2.45$ cm , where there is a uniform vertical electric field with magnitude $E=8.40\times {10}^{4}$ N/C

If a drop is to be deflected a distance d= 0.270 mm by the time it reaches the end of the deflection plate,what magnitude of charge q must be given to the drop? (Assume that the density of the ink drops 1000 $k\frac{g}{{m}^{3}}$, and ignore the effects of gravity.)

Secondary
Answered

Falak Kinney
2020-11-05

A 292 kg motorcycle is accelerating up along a ramp that is inclined 30.0° above the horizontal. The propulsion force pushing the motorcycle up the rampis 3020 N, and air resistance produces a force of 250 N that opposes the motion. Find the magnitude of the motorcycles

Secondary
Answered

Harlen Pritchard
2020-11-05

A 0.50 kg ball that is tied to the end of a 1.1 m light cord is revolved in a horizontal planewith the cord making a $30}^{\circ$ angle, with the vertical.

a) Determine the ball speed.

b) If, instead, the ball is revolved so that its speed is 4.0 m/s,what angle does the cord make with the vertical?

c) If the cord can withstand a maximum tension of 9.1 N, what is the highest speed at which the ballcan move?

Secondary
Answered

Line
2020-11-03

An extreme skier, starting from rest, coasts down a mountainthat makes an angle $25.0}^{\circ$ with the horizontal. The coefficient of kinetic friction between her skis and the snow is 0.200. She coasts for a distance of 11.9 m before coming to the edge of a cliff. Without slowing down, she skis offthe cliff and lands down hill at a point whose vertical distance is 4.20 m below the edge. How fast is she going just before she lands?

Secondary
Answered

Reggie
2020-11-01

A rifle with a weight of 30 N fires a 5.0 g bullet with a speed of 300m/s. (a) Find the recoil speed of the rifle. (b) If a700 N man holds the rilfe firmly against his shoulder, find there coil speed of the man and his rifle.

Secondary
Answered

York
2020-10-28

Ropes 3m and 5m in length are fastened to a holiday decoration that is suspended over a town square. The declaration has a mass of 5kg. The ropes, fastened at different heights, make angles of 52 degrees and 40 degrees with the horizontal. Find the tension in each wire and the magnitude of each tension.

Secondary
Answered

aortiH
2020-10-27

Problem: A 0.500kg block attached to a spring with the length 0.60m and force constant k=40.0 N/m is at rest with the back of the block at point A on a frictionless, horizontal airtable. The mass of the spring is negligible. You pull the block tothe right along the surface with a constant horizontal forceF=20.0-6N.

Questions:

A.) What is the blocks

Secondary
Answered

Ayaana Buck
2020-10-27

If a negative charge is initially at rest in an electric field, will it move toward a region of higher potential or lower potential? What about a positive charge? How does the potential energy of the charge change in each instance?

Secondary
Answered

Cabiolab
2020-10-27

A rocket is fired in deep space, where gravity is negligible. In the first second it ejects of $\frac{1}{160}$ its mass as exhaust gas and has an acceleration of $16.0\text{}\frac{m}{{s}^{2}}$.

What is the speed of the exhaust gas relative to the rocket?

Secondary
Answered

ringearV
2020-10-26

A 1.0 kg ball and a 2.0 kg ball are connected by a 1.0-m-long rigid, massless rod. The rod is rotating cw about its center of mass at 20 rpm. What torque will bring the balls to a halt in 5.0 s? Answer in Nm.

Secondary
Answered

Armorikam
2020-10-23

A lunch tray is being held in one hand, as the drawing illustrates. The mass of the tray itself is 0.200 kg, and its center of gravity is located tits geometrical center. On the tray is a 1.00 kg plate of food and a 0.190 kg cup of coffee. Obtain the force T exerted by the thumb and the force F exerted by the four fingers. Both forces act perpendicular to the tray, which is being held parallel to the ground.

Secondary
Answered

midtlinjeg
2020-10-21

An 80.0-kg skydiver jumps out of a balloon at an altitude of1000 m and opens the parachute at an altitude of 200 m. (a) Assuming that the total retarding force on the diver is constant at 50.0 N with the parachute closed and constant at 3600 N with the parachute open, what is the speed of the diver whenhe lands on the ground? (b) Do you think the skydiver will be injured? Explain. (c) At what height should the parachute be opened so that the final speed of the skydiver when he hits the ground is 5.00m/s? (d) How realistic is the assumption that the total retarding force is constant? Explain.

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