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# Physics help

13. A water droplet of radius 0.018mm remains stationary in air. If the downward electric field in 150N/C, how many excess electrons must the droplet have?

# Physics help

An electric dipole consists of a pint charge -q at the point (0,a) and a point charge q at the pint(0,-a). Find the electric field at the point (x,0).

# why does one cool faster

58. Which has the higher specific heat capacity: an object that cools quickly or an object of the same mass that cools more slowly?

# why is his feet not cut

. The photo shows physics teacher Marshall Ellenstein walking barefoot on broken glass bottles in his class. What physics concept is Marshall demonstrating, and why is...

# what is the formula

. Show that the water pressure at the bottom of the 50-m-high water tower in Figure 5.3 is 490,000 N/m2, or is approximately 500 kPa

# is there a difference

In a sporting goods store you see what appears to be two identical life preservers of the same size. One is filled with Styrofoam and the other one is filled with lead pellets. If you...

# Given the vectors below, determine the resultant and the equilibrant using trigonometry.

230.0 newtons @ 125 degrees 175.0 newtons @ 60.0 degrees

# From Graphical Analysis

Please help me with this. It looks long, but it really is not. A physics student wants to determine the relationship between the radius of a charged conducting sphere and the magnitude of...

# Archimedes Principle

Please help! I just do not even know what I'm doing, and currently waiting for tutors to respond to work with me one on one.     An unknown fluid could be determined from   ρfl=(T-T'')/(T-T')...

# Uncertainty of the centripetal force

A lab experiment was performed to find the centripetal force on a rotating body which measured mass(m), frequency(n), and radius(r).  It was found that Fc=4Π2n2mr.  How do I write an expression...

# Optical Density

What Is Optical Density? Difference between optical and mass density!

# the frequency =100 HZ, find the the time between first crest and forth trough

how to get the time from this given    my answer is  f=100      p.t= 1/100   t=0.01 sec is that right?

# What's the maximum speed?

A compressed spring has 16 J of potential energy. What's the maximum speed it can impart to a 2 kg object?   Answer: 4.0 m/s

# What's the potential energy?

A force of 10 N stretches a spring that has a spring constant of 20 N/m. What's the potential energy stored in the spring?   Answer: 2.5 J

# HELP please. Physics question.

A primitive diving bell consists of a cylindrical tank with one end open and one end closed. The tank is lowered into a freshwater lake, open end downward. Water rises into the...

# Powdered steel is placed in a container filled with oxygen and fitted with a piston that moves to keep the pressure in the container constant

Powdered steel is placed in a container filled with oxygen and fitted with a piston that moves to keep the pressure in the container constant at one atmosphere. A chemical reaction occurs that produces...

# I need help with this phyics homework

a car is submerged in 8.0 feet of water. assuming the area of one door(including window) is 10.0 ft^2. what is the pressure on the door?

# Find the tension?

Luke Autbeloe twirls a 750 gram mass on the end of a 0.82 meter string. Find the tension at the top and bottom of the orbit. Assume the mass's velocity at both top and bottom is 3.7 m/s.

# What's the slowest speed?

A frictionless rollercoaster does a vertical loop with a radius of 6.0 m. What's the slowest speed that the rollercoaster must have at the top of the loop and avoid falling?

# What must be the friction?

Harry Hotrod rounds a corner in his sports car at 50 km/h. The friction force holds him on the road. If he has twice the speed, what must be the friction force to prevent him from skidding off the...