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# Air Resistance

1. Give three factors that affect the amount of air resistance an object experiences, and describe how each factor influences air resistance (will the air resistance go up, or go down if that variable...

# phy (force)

A helicopter of mass 2500 kg carries a bucket of water to fight a wildfire.The total mass of the bucket is 2000 kg.the helicopter accelerates horizontally and the suspension cord makes an angle of...

Compute the normal force on the block. M=47.3 kg and theta=31.0 degrees

# how does a hot air balloon stay at neutral buoyancy?

i have to explain this on a paper and i dont know how to start

# Physics speed

A calcium ion Ca++ enters with zero velocity a region of uniform electric field of 200N/C pointing east.  What is its speed after 50ms? (Symbol of calcium atom is 20Ca40)

# 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