Physics

The reflecting surfaces of two plane mirrors are perpendicular to ea

The reflecting surfaces of two plane mirrors are perpendicular to ea

 The reflecting surfaces of two plane mirrors are perpendicular to each other. How many images of himself will a person standing at a certain distance from the intersection of these mirrors see?

The answer is three but i don't underst

physicsnerd08   1169   1 Reply

bio_man

The sum of vectors A and B is

The sum of vectors A and B is

emilyhoffman   104   2 Replies

emilyhoffman

DDT, C14H9Cl5, is a very effective insecticide. It is hazardous to other spe

DDT, C14H9Cl5, is a very effective insecticide. It is hazardous to other spe

 

DDT, C14H9Cl5, is a very effective insecticide. It is hazardous to other species, however, because it tends to accumulate in the food chain. Shown above is its chemical structure. Suggest why it remains on plants and in soils for e

einsteindude   525   2 Replies

bSharp

In the 110-V circuit shown,

In the 110-V circuit shown,

 

In the 110-V circuit shown,
A) 110 C of charge flow through the lamp every second.
B) 110 J of energy are converted to heat and light in the circuit every second.
C) 110 J of energy are given to each coulomb of ch

einsteindude   1002   1 Reply

bSharp

128.0 g of water is heated using 67.0 W of power, with perfect efficiency. Ho

128.0 g of water is heated using 67.0 W of power, with perfect efficiency. Ho

 
128.0 g of water is heated using 67.0 W of power, with perfect efficiency. How long will it take to raise the temperature of the water from 15°C  to 25°C ? 
A)
 
80 s 
B)
 
4.6 s 

mikael   559   3 Replies

Alex Ruiz

300 J of work are required to fully drive a stake into the ground. If the ave

300 J of work are required to fully drive a stake into the ground. If the ave

 
300 J of work are required to fully drive a stake into the ground. If the average resistive force on the stake by the ground is 601 N, how long is the stake? 
A)
 
0.50 m 
B)
 
0.32 m 

mikael   469   2 Replies

mikael

4.00 × 105 J of work are done on a 1178 kg car while it accelerates from 10.0

4.00 × 105 J of work are done on a 1178 kg car while it accelerates from 10.0

 
4.00 × 105 J of work are done on a 1178 kg car while it accelerates from 10.0 m/s to some final velocity. Find this final velocity. 
A)
 
27.9 m/s 
B)
 
22.3 m/s 
C)
 
25.

mikael   377   2 Replies

mikael

51 J of work are needed to stretch a spring from 1.4 m to 2.9 m from equilibr

51 J of work are needed to stretch a spring from 1.4 m to 2.9 m from equilibr

 
51 J of work are needed to stretch a spring from 1.4 m to 2.9 m from equilibrium. What is the value of the spring constant? 
A)
 
16 N/m 
B)
 
45 N/m 
C)
 
31 N/m 

mikael   563   2 Replies

mikael

A 0.033 kg block on a horizontal frictionless surface is attached to a sprin

A 0.033 kg block on a horizontal frictionless surface is attached to a sprin

 
A  0.033 kg block on a horizontal frictionless surface is attached to a spring whose force constant is 130 N/m. The block is pulled from its equilibrium position at x  = 0 m to a displacement x = +0.080m and is released from re

mikael   504   3 Replies

feliciagwhite

A 0.044 kg block on a horizontal frictionless surface is attached to a sprin

A 0.044 kg block on a horizontal frictionless surface is attached to a sprin

 
A  0.044 kg block on a horizontal frictionless surface is attached to a spring whose force constant is 360 N/m. The block is pulled from its equilibrium position at x = 0m to a displacement x = +0.080m and is released from rest. The

mikael   427   2 Replies

mikael

A 0.065 kg block on a horizontal frictionless surface is attached to a sprin

A 0.065 kg block on a horizontal frictionless surface is attached to a sprin

 
A  0.065 kg block on a horizontal frictionless surface is attached to a spring whose force constant is 290 N/m. The block is pulled from its equilibrium position at x = 0 m to a displacement x = +0.080 m and is released from rest. T

mikael   392   2 Replies

mikael

A 0.099 kg block on a horizontal frictionless surface is attached to a sprin

A 0.099 kg block on a horizontal frictionless surface is attached to a sprin

 
A  0.099 kg block on a horizontal frictionless surface is attached to a spring whose force constant is 530 N/m. The block is pulled from its equilibrium position at x = 0 m to a displacement x = +0.080 m and is released from rest. T

mikael   375   2 Replies

mikael

A 0.20 m3 gas tank holds 6.0 moles of ideal nitrogen gas (diatomic), at a t

A 0.20 m3 gas tank holds 6.0 moles of ideal nitrogen gas (diatomic), at a t

 
A  0.20 m3 gas tank holds  6.0 moles of ideal nitrogen gas (diatomic), at a temperature of 290K. The atomic mass of nitrogen is 14.0 g/mol and the molecular radius is 3.0 × 10-10m. The pressure of the gas, in kPa, is closest to

mikael   543   2 Replies

mikael

A 0.23 kg block on a horizontal frictionless surface is attached to a spring

A 0.23 kg block on a horizontal frictionless surface is attached to a spring

 
A  0.23 kg block on a horizontal frictionless surface is attached to a spring whose force constant is 470 N/m. The block is pulled from its equilibrium position at x = 0m to a displacement x = +0.080m and is released from rest. The

mikael   461   2 Replies

mikael

A 0.40 m3 gas tank holds 5.0 moles of ideal nitrogen gas (diatomic), at a t

A 0.40 m3 gas tank holds 5.0 moles of ideal nitrogen gas (diatomic), at a t

 
A  0.40 m3 gas tank holds  5.0 moles of ideal nitrogen gas (diatomic), at a temperature of 360K. The atomic mass of nitrogen is 14.0 g/mol and the molecular radius is 3.0 × 10-10m. The mass density of the gas, in SI units, is c

mikael   652   2 Replies

mikael

A 0.60 m3 gas tank holds 7.0 moles of ideal nitrogen gas (diatomic), at a t

A 0.60 m3 gas tank holds 7.0 moles of ideal nitrogen gas (diatomic), at a t

 A  0.60 m3 gas tank holds  7.0 moles of ideal nitrogen gas (diatomic), at a temperature of 350 K. The atomic mass of nitrogen is 14.0 g/mol and the molecular radius is 3.0 × 10-10m. The rms speed of the molecules, in SI units, is closest t

mikael   615   3 Replies

Anonymous

A 0.610 m string is clamped at both ends. If the lowest standing wave freque

A 0.610 m string is clamped at both ends. If the lowest standing wave freque

 
A  0.610 m string is clamped at both ends. If the lowest standing wave frequency in the string is 326 Hz, what is the wave speed? 
A)
 
398 m/s 
B)
 
494 m/s 
C)
 
60

mikael   541   2 Replies

mikael

A 1.0 g string, 0.59 m long, is under tension. The string produces a 800 H

A 1.0 g string, 0.59 m long, is under tension. The string produces a 800 H

 
A  1.0 g string,  0.59 m long, is under tension. The string produces a  800 Hz tone when it vibrates in the third harmonic. The speed of sound in air is 344 m/s. In this situation, the wavelength of the standing wave in th

mikael   450   2 Replies

mikael

A 1.7 L volume of ideal neon gas (monatomic) is at a pressure of 6.2 atmosp

A 1.7 L volume of ideal neon gas (monatomic) is at a pressure of 6.2 atmosp

 
A  1.7 L volume of ideal neon gas (monatomic) is at a pressure of  6.2 atmospheres and a temperature of 270K. The atomic mass of neon is 20.0 g/mol. The mass of the neon gas, in SI units, is closest to: 
A)
 

mikael   443   2 Replies

mikael

A 1.8 kg block attached to a spring executes simple harmonic motion on a fri

A 1.8 kg block attached to a spring executes simple harmonic motion on a fri

 
A  1.8 kg block attached to a spring executes simple harmonic motion on a frictionless horizontal surface. At time t = 0 s, the block has a displacement of -0.70 m, a velocity of -0.80 m/s, and an acceleration of +4.0 m/s2. The ampl

mikael   352   2 Replies

mikael

A 147 N force is needed to slide a 50.0 kg box across a flat surface at a co

A 147 N force is needed to slide a 50.0 kg box across a flat surface at a co

 
A  147 N force is needed to slide a 50.0 kg box across a flat surface at a constant velocity. What is the coefficient of kinetic friction between the box and the floor? 
A)
 
0.30 
B)
 
0.

mikael   371   2 Replies

mikael

A 1484 kg car climbs a 5.0° slope at a constant velocity of 80.0 km/h. Assum

A 1484 kg car climbs a 5.0° slope at a constant velocity of 80.0 km/h. Assum

 
A  1484 kg car climbs a 5.0° slope at a constant velocity of 80.0 km/h. Assuming that air resistance may be neglected, at what rate must the engine deliver energy to the drive wheels of the car? Express your answer in kW. 

mikael   958   4 Replies

habiba

A 160 g metal container, insulated on the outside, holds 80 g of water in t

A 160 g metal container, insulated on the outside, holds 80 g of water in t

 
A  160 g metal container, insulated on the outside, holds  80 g of water in thermal equilibrium at 22°C. A  23 g ice cube, at the melting point, is dropped into the water, and when thermal equilibrium is reached the temper

mikael   383   2 Replies

mikael

A 19 kg sample of mercury is completely solidified and liberates 220.02kJ of

A 19 kg sample of mercury is completely solidified and liberates 220.02kJ of

 
A  19 kg sample of mercury is completely solidified and liberates 220.02kJ of energy. What is the original temperature of the mercury? (The melting point of mercury is 234K, the heat of fusion of mercury is 11.3 kJ/kg, and the speci

mikael   413   2 Replies

mikael

A 1967 kg sample of water at 0°C is cooled to -43°C , and freezes in the pro

A 1967 kg sample of water at 0°C is cooled to -43°C , and freezes in the pro

 
A  1967 kg sample of water at 0°C is cooled to -43°C , and freezes in the process. How much heat is liberated? (For water Lf = 334 kJ/jg and  Lv = 2257 kJ/kg. The specific heat for ice is 2050 J/kg • K.)
A)
 
8

mikael   515   2 Replies

mikael

A 20 g bullet pierces a sand bag 45 cm thick. If the initial bullet velocity

A 20 g bullet pierces a sand bag 45 cm thick. If the initial bullet velocity

 
A  20 g bullet pierces a sand bag 45 cm thick. If the initial bullet velocity was 74 m/s and it emerged from the sandbag with 32 m/s, what is the magnitude of the friction force (assuming it to be constant) the bullet experienced wh

mikael   685   4 Replies

Lydia Dalton O_Dell

A 20 kg box must be slid across the floor. If the coefficient of static fric

A 20 kg box must be slid across the floor. If the coefficient of static fric

 
A  20 kg box must be slid across the floor. If the coefficient of static friction between the box and floor is 0.37, what is the minimum force needed to start the box moving from rest? 
A)
 
73 N 
B)

mikael   383   2 Replies

mikael

A 3.3 kg solid sphere, made of metal whose density is 4900 kg/m3, is suspen

A 3.3 kg solid sphere, made of metal whose density is 4900 kg/m3, is suspen

 
A  3.3 kg solid sphere, made of metal whose density is  4900 kg/m3, is suspended by a cord. The density of water is 1000 kg/m3. When the sphere is immersed in water, the tension in the cord is closest to: 
A)
 

mikael   497   1 Reply

padre

A 4.0 kg sample of ice is at 0.00°C. How much heat is needed to melt it? (Fo

A 4.0 kg sample of ice is at 0.00°C. How much heat is needed to melt it? (Fo

 
A  4.0 kg sample of ice is at 0.00°C. How much heat is needed to melt it? (For water Lf = 334 kJ/jg and
Lv = 2257 kJ/kg.) 
A)
 
1.34 × 103 kJ 
B)
 
3.65 × 105 kJ 
C)

mikael   633   1 Reply

padre

A 4.6 kg solid sphere, made of metal whose density is 3800 kg/m3, is suspen

A 4.6 kg solid sphere, made of metal whose density is 3800 kg/m3, is suspen

 
A  4.6 kg solid sphere, made of metal whose density is  3800 kg/m3, is suspended by a cord. The sphere floats when placed in a liquid of density 4200 kg/m3. The fraction of the volume of the sphere that is submerged is closest

mikael   367   2 Replies

mikael

A 400.0 cm rope under a tension of 110.0 N is set into oscillation. The mass

A 400.0 cm rope under a tension of 110.0 N is set into oscillation. The mass

 
A  400.0 cm rope under a tension of 110.0 N is set into oscillation. The mass density of the rope is 170.0 g/cm. What is the frequency of the first harmonic mode (m = 2)? 
A)
 
0.64 Hz 
B)
 

mikael   462   2 Replies

mikael

A 467.0 kg copper bar is put into a smelter for melting. The initial tempera

A 467.0 kg copper bar is put into a smelter for melting. The initial tempera

 
A  467.0 kg copper bar is put into a smelter for melting. The initial temperature of the copper is 300.0 K. How much heat must the smelter produce to completely melt the copper bar? (The specific heat for copper is 386 J/kg • K, the

mikael   345   2 Replies

mikael

A 5.0 g string, 0.51 m long, is under tension. The string produces a 200 H

A 5.0 g string, 0.51 m long, is under tension. The string produces a 200 H

 
A  5.0 g string,  0.51 m long, is under tension. The string produces a  200 Hz tone when it vibrates in the third harmonic. The speed of sound in air is 344 m/s. The tension in the string, in SI units, is closest to: 

mikael   482   3 Replies

Anonymous

A 5.0 L volume of ideal neon gas (monatomic) is at a pressure of 4.2 atmosp

A 5.0 L volume of ideal neon gas (monatomic) is at a pressure of 4.2 atmosp

 
A  5.0 L volume of ideal neon gas (monatomic) is at a pressure of  4.2 atmospheres and a temperature of 450K. The atomic mass of neon is 20.2 g/mol. The number of neon atoms in the gas is closest to: 
A)
 

mikael   374   3 Replies

jennylee1989

A 53 kg mass is connected to a nail on a frictionless table by a (massless)

A 53 kg mass is connected to a nail on a frictionless table by a (massless)

 
A  53 kg mass is connected to a nail on a frictionless table by a (massless) string of length 1.3 m. If the tension in the string is 51N while the mass moves in a uniform circle on the table, how long does it take for the mass to ma

mikael   651   2 Replies

mikael

A 570 g empty iron kettle is put on a stove. How much heat in joules must it

A 570 g empty iron kettle is put on a stove. How much heat in joules must it

 
A  570 g empty iron kettle is put on a stove. How much heat in joules must it absorb to raise its temperature form
15.0°C  to 69.0°C? (The specific heat for iron is 113 cal/kg · °C.) 
A)
 
14,600 J&n

mikael   478   2 Replies

mikael

A 62 g steel ball is released from rest and falls vertically onto a steel pl

A 62 g steel ball is released from rest and falls vertically onto a steel pl

 
A  62 g steel ball is released from rest and falls vertically onto a steel plate. The ball strikes the plate and is in contact with it for 0.5 ms. The ball rebounds elastically, and returns to its original height. The time interval

mikael   539   2 Replies

mikael

A 623.0 g iron meteor impacts the earth at a speed of 2945.0 m/s. If its kin

A 623.0 g iron meteor impacts the earth at a speed of 2945.0 m/s. If its kin

 
A  623.0 g iron meteor impacts the earth at a speed of 2945.0 m/s. If its kinetic energy is entirely converted to heat of the meteorite, what will the resultant temperature rise be? (The specific heat for iron is 113 cal/kg · °C.)&n

mikael   264   2 Replies

mikael

A 67.0 kg bungee jumper jumps off a bridge and undergoes simple harmonic mot

A 67.0 kg bungee jumper jumps off a bridge and undergoes simple harmonic mot

 
A  67.0 kg bungee jumper jumps off a bridge and undergoes simple harmonic motion. If the period of oscillation is
11.2 s, what is the spring constant of the bungee cord? 
A)
 
21.1 N/m 
B)

mikael   449   3 Replies

Sophia Woodward

A 7.0 µC positive charge is located at the origin and a 3.0 C positive char

A 7.0 µC positive charge is located at the origin and a 3.0 C positive char

 
A  7.0 µC positive charge is located at the origin and a 3.0  C positive charge is located at x = 0.0 m, y = 1.0 m. Find the point between them where the electric field strength is zero. 
A)
 
x = 0 m, y =

mikael   987   2 Replies

mikael