Physics

A car approaches a stationary police car at 36 m/s. The frequency of the siren (relative to the ...

A car approaches a stationary police car at 36 m/s. The frequency of the siren (relative to the ...

A car approaches a stationary police car at 36 m/s. The frequency of the siren (relative to the police car) is 500 Hz. What is the frequency (in Hz) heard by an observer in the moving car as he approaches the police car? (Assume the velocity of sound

123kduncan   44   2 Replies

123kduncan

The horizontal rows of elements in the periodic table are called

The horizontal rows of elements in the periodic table are called

The horizontal rows of elements in the periodic table are called
 a. periods.
  b. groups.
  c. families.
  d. series.


[Ques. 2] Geologic evidence that supports the theory of continental

123kduncan   53   3 Replies

Farloo014

Eighty-eight prominent groups of stars in the sky are called the _______________.

Eighty-eight prominent groups of stars in the sky are called the _______________.

Eighty-eight prominent groups of stars in the sky are called the _______________.
 a. constellations
  b. local groups
  c. clusters
  d. galaxies


[Ques. 2] A current of 6.0 A flows throu

123kduncan   120   3 Replies

datstragicbro

A system of an electron, a proton, and a neutron has a net charge of

A system of an electron, a proton, and a neutron has a net charge of

A system of an electron, a proton, and a neutron has a net charge of
 a. +1.6  10-19 C.
  b. 1.6  10-19 C.
  c. 3.2  10-19 C.
  d. zero.


[Ques. 2] Suppose a 5.0-meter diameter telescope w

123kduncan   71   2 Replies

123kduncan

The image of a real object formed by a single converging lens cannot be

The image of a real object formed by a single converging lens cannot be

The image of a real object formed by a single converging lens cannot be
 a. real, inverted, and enlarged.
  b. real, inverted, and the same size as the object.
  c. virtual, upright, and enlarged.
  d. real, inverted, and reduced

123kduncan   51   2 Replies

123kduncan

In a heat pump, (Multiple Choice)

In a heat pump, (Multiple Choice)

In a heat pump,
 a. heat is used to do work.
  b. heat flows spontaneously.
  c. the same process is used as in a heat engine.
  d. work is used to transfer heat.


[Ques. 2] How many grams

123kduncan   97   2 Replies

123kduncan

A current-carrying 2.0-cm long segment of wire is inside a long solenoid (radius = 4.0 cm, n = 800 ...

A current-carrying 2.0-cm long segment of wire is inside a long solenoid (radius = 4.0 cm, n = 800 ...

A current-carrying 2.0-cm long segment of wire is inside a long solenoid (radius = 4.0 cm, n = 800 turns/m, current = 50 mA). The wire segment is oriented perpendicularly to the axis of the solenoid. If the current in the wire segment is 12 A, what i

123kduncan   73   2 Replies

123kduncan

Before light can undergo total internal reflection when incident on material 2 from material 1, what ...

Before light can undergo total internal reflection when incident on material 2 from material 1, what ...

Before light can undergo total internal reflection when incident on material 2 from material 1, what must be true of the indices of refraction?
 a. n1 = n2
  b. n1 < n2
  c. n1 > n2
  d. Either n1 or n2 must be equal to 1.
[br

123kduncan   94   2 Replies

123kduncan

A ray of light is incident on the mid-point of a glass prism surface at an angle of 23.4 with the ...

A ray of light is incident on the mid-point of a glass prism surface at an angle of 23.4 with the ...

A ray of light is incident on the mid-point of a glass prism surface at an angle of 23.4 with the normal. For the glass, n = 1.60, and the prism apex angle is 51.8. What is the angle of incidence at the glass-to-air surface on the side opposite where

123kduncan   282   2 Replies

123kduncan

A box is pushed across a horizontal table by a boy applying a force of 32 N to the box. A force of ...

A box is pushed across a horizontal table by a boy applying a force of 32 N to the box. A force of ...

[html]A box is pushed across a horizontal table by a boy applying a force of 32 N to the box. A force of friction of magnitude 19 N acts opposite the direction of motion. A stiff wind also opposes the box’s motion. What force does the box exert on

123lol456   23   1 Reply

djl4909

Five children are pushing on a snowball; each pushes with a force of magnitude 10.0 N, and each is ...

Five children are pushing on a snowball; each pushes with a force of magnitude 10.0 N, and each is ...

[html]Five children are pushing on a snowball; each pushes with a force of magnitude 10.0 N, and each is pushing at an angle of 45° relative to his neighbor. What is the magnitude of the net push on the ball?

▸ 0 N

▸ 24.1 N

▸

123lol456   21   1 Reply

chanelstar27

An organ pipe is open at both ends. The frequency of the fourth mode is 316 Hz higher than the ...

An organ pipe is open at both ends. The frequency of the fourth mode is 316 Hz higher than the ...

[html]An organ pipe is open at both ends. The frequency of the fourth mode is 316 Hz higher than the frequency of the third mode. If the speed of sound is 340 m/s, then what is the length of the organ pipe?

▸ 53.8 cm

▸ 59.8 cm

123lol456   26   1 Reply

solid1

A horizontally projected beam of electrons travels at 55 km/s into the space between two horizontal, ...

A horizontally projected beam of electrons travels at 55 km/s into the space between two horizontal, ...

[html]A horizontally projected beam of electrons travels at 55 km/s into the space between two horizontal, parallel plates. The plates are separated by 7.4 cm, and they are 12 cm long. The uniform electric field between the plates is 7.2 mV/m upwa

123lol456   26   1 Reply

taylor.eihausen

A series LR circuit includes a 9.00 V battery, a 30.0 mH inductor, and a resistance of 5.00 . What ...

A series LR circuit includes a 9.00 V battery, a 30.0 mH inductor, and a resistance of 5.00 . What ...

[html]A series LR circuit includes a 9.00 V battery, a 30.0 mH inductor, and a resistance of 5.00 Ω. What is the time constant of this circuit?

123lol456   28   1 Reply

choroni64

A ball is thrown straight up from a 20.0 meter cliff at 17.5 m/s. the ball goes up and then all the ...

A ball is thrown straight up from a 20.0 meter cliff at 17.5 m/s. the ball goes up and then all the ...

A ball is thrown straight up from a 20.0 meter cliff at 17.5 m/s. the ball goes up and then all the way to the ground below the cliff.
Find: How high did the ball go and how fast was it going when it hit the ground?
Up     

17mcole   320   N/A

17mcole

An Air Force jet lands on a straight runway with a forward velocity of 75 m/s and the pilot applies ...

An Air Force jet lands on a straight runway with a forward velocity of 75 m/s and the pilot applies ...

An Air Force jet lands on a straight runway with a forward velocity of 75 m/s and the pilot applies the brakes at a constitutional rate for 20 seconds until the jet slows to 10 m/s. How far down the runway did the jet go during this time?
[field

17mcole   459   N/A

17mcole

A ball is thrown upward with a velocity of 19.6 m/s. What is its velocity after 3.00 s?

A ball is thrown upward with a velocity of 19.6 m/s. What is its velocity after 3.00 s?

A ball is thrown upward with a velocity of 19.6 m/s. What is its velocity after 3.00 s?

▸ 9.80 m/s up

▸ zero

▸ 19.6 down

▸ 9.80 m/s down

18iq   21   1 Reply

ordinarykathy

If a flea can jump up to 45 cm above its initial starting point, with what speed is it able to leave ...

If a flea can jump up to 45 cm above its initial starting point, with what speed is it able to leave ...

If a flea can jump up to 45 cm above its initial starting point, with what speed is it able to leave the ground when jumping?

▸ 2.1 m/s

▸ 3.0 m/s

▸ 8.8 m/s

▸ 4.2 m/s

18iq   21   1 Reply

jennaforiero

A 4.00 kg hollow cylinder of radius 5.00 cm starts from rest and rolls without slipping down a 30.0 ...

A 4.00 kg hollow cylinder of radius 5.00 cm starts from rest and rolls without slipping down a 30.0 ...

[html]A 4.00 kg hollow cylinder of radius 5.00 cm starts from rest and rolls without slipping down a 30.0 degree incline. The acceleration of the center of mass of the cylinder is

▸ 2.45 m/s2.

▸ 2.98 m/s2.

18iq   22   1 Reply

clubber25

Who discovered radioactivity?

Who discovered radioactivity?

Who discovered radioactivity?

▸ Niels Bohr

▸ Marie Curie

▸ Albert Einstein

▸ Henri Becquerel

▸ Richard Feynman

18iq   30   1 Reply

billbye

Accelerated electron beams are often used to study features of atoms on the surfaces of materials. ...

Accelerated electron beams are often used to study features of atoms on the surfaces of materials. ...

[html]Accelerated electron beams are often used to study features of atoms on the surfaces of materials. If you wanted to alter the design of an electron accelerator to produce an electron beam appropriate for the studying the nuclei of atoms instead

18iq   42   1 Reply

isaw09

In the figure, a T-bar ski tow pulls a skier up a hill inclined at 10 above horizontal. The skier ...

In the figure, a T-bar ski tow pulls a skier up a hill inclined at 10 above horizontal. The skier ...

[html]In the figure, a T-bar ski tow pulls a skier up a hill inclined at 10° above horizontal. The skier starts from rest and is pulled by a cable that exerts a tension

19sspeck   90   1 Reply

swygant

Four resistors are connected across an 8-V DC battery as shown in the figure. The current through ...

Four resistors are connected across an 8-V DC battery as shown in the figure. The current through ...

[html]Four resistors are connected across an 8-V DC battery as shown in the figure. The current through the 9-Ω resistor is closest to

19sspeck   64   1 Reply

deathwing

The figure shows the displacement y of a wave at a given position as a function of time and the ...

The figure shows the displacement y of a wave at a given position as a function of time and the ...

[html]The figure shows the displacement y of a wave at a given position as a function of time and the displacement of the same wave at a given ti

19sspeck   52   1 Reply

Ian1234

A particle of interplanetary dust is close to the Sun and interacts with the Sun

A particle of interplanetary dust is close to the Sun and interacts with the Sun

A particle of interplanetary dust is close to the Sun and interacts with the Sun's gravitational field as well as with the light emitted by the Sun. If it only interacts appreciably with the Sun, can it be pushed away from the Sun instead of bei

1vetboy   1570   1 Reply

bio_man

A conducting loop of wire has an area of 150 cm2 and a resistance of 25.0 Ω

A conducting loop of wire has an area of 150 cm2 and a resistance of 25.0 Ω

A conducting loop of wire has an area of 150 cm2 and a resistance of 25.0 Ω. There is a magnetic field of 100 T perpendicular to the loop. At what rate must this field be reduced to induce a current of 0.100 A in the loop?

I know the answe

1vetboy   2981   1 Reply

tattnurse

Which one of the following is a correct statement for a number of resistors conn

Which one of the following is a correct statement for a number of resistors conn

Which one of the following is a correct statement for a number of resistors connected in series or parallel?

200490570   366   1 Reply

padre

An object that has zero resistance is a __________. (Fill in the blank)

An object that has zero resistance is a __________. (Fill in the blank)

An object that has zero resistance is a __________.
 Fill in the blank(s) with correct word


[Ques. 2] In the U.S., AC line voltage oscillates at a frequency of __________.
 Fill in the blank(s) wi

2goodgabe   63   2 Replies

2goodgabe

The power consumed by the light bulb is 20 watts. Indicate whether the statement is true or ...

The power consumed by the light bulb is 20 watts. Indicate whether the statement is true or ...

The power consumed by the light bulb is 20 watts.
  Indicate whether the statement is true or false


[Ques. 2] The resistance of the light bulb is 20 ohms.
  Indicate whether the statement is true

2goodgabe   66   1 Reply

peytonjl

Planetary orbits are circles. Indicate whether the statement is true or ...

Planetary orbits are circles. Indicate whether the statement is true or ...

Planetary orbits are circles.
  Indicate whether the statement is true or false


[Ques. 2] What is the relationship between Bohr's model and the characteristic spectral lines of gases?
 a. None. Bo

2goodgabe   67   1 Reply

imhoturnot

A proton with mass 1.67 10-27 kg moves with a speed of 0.800c in an accelerator. What is its ...

A proton with mass 1.67 10-27 kg moves with a speed of 0.800c in an accelerator. What is its ...

A proton with mass 1.67  10-27 kg moves with a speed of 0.800c in an accelerator. What is its relativistic momentum? (c = 3.00  108 m/s)
 a. 2.40  10-19 kgm/s
  c. 0.530  10-19 kgm/s
  b. 6.68  10-19 kgm/s
  d. 3.76  10-19 kgm/s[

2goodgabe   290   2 Replies

2goodgabe

If I1 goes to the right through R1, I2 goes to the right through R2, and I3 goes to the right ...

If I1 goes to the right through R1, I2 goes to the right through R2, and I3 goes to the right ...

If I1 goes to the right through R1, I2 goes to the right through R2, and I3 goes to the right through R3, what is the resulting

2goodgabe   55   2 Replies

2goodgabe

A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 20 m/s ...

A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 20 m/s ...

A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 20 m/s north, and the total acceleration of the car is 2.5 m/s2 37 south of west. Which of the following is correct?
 a. R = 0.40 km, and the car's spee

2goodgabe   64   2 Replies

2goodgabe

We live in the period called the

We live in the period called the

We live in the period called the
 a. Cenozoic.
  b. Holocene.
  c. Ordovician.
  d. Quaternary.


[Ques. 2] The Paleozoic era ended with an event called the
 a. Chicxulub Impact.

2goodgabe   62   2 Replies

2goodgabe

The highest tides are called ______________ tides. (Fill in the blank)

The highest tides are called ______________ tides. (Fill in the blank)

The highest tides are called ______________ tides.
 Fill in the blank(s) with correct word


[Ques. 2] In a battery circuit with different resistors in parallel,
 a. the total resistance is larger t

2goodgabe   53   3 Replies

Kellivycital

The rate of a chemical reaction would be increased by

The rate of a chemical reaction would be increased by

The rate of a chemical reaction would be increased by
 a. increasing the surface area of the reactants.
  b. increasing the concentration of the reactants.
  c. adding a catalyst to the reactants.
  d. heating the reactants.

2goodgabe   74   2 Replies

2goodgabe

A proton is accelerated from rest through a potential difference of 150 V. It then enters a region ...

A proton is accelerated from rest through a potential difference of 150 V. It then enters a region ...

A proton is accelerated from rest through a potential difference of 150 V. It then enters a region of uniform magnetic field and moves in a circular path (radius = 12 cm). What is the magnitude of the magnetic field in this region?
 a. 18 mT

2goodgabe   131   3 Replies

Amrit Bains

A proton moves around a circular path (radius = 2.0 mm) in a uniform 0.25-T magnetic field. What ...

A proton moves around a circular path (radius = 2.0 mm) in a uniform 0.25-T magnetic field. What ...

A proton moves around a circular path (radius = 2.0 mm) in a uniform 0.25-T magnetic field. What total distance does this proton travel during a 1.0-s time interval? (m = 1.67  1027 kg, q = 1.6  1019 C)
 a. 82 km
  b. 59 km
  c. 71 km

2goodgabe   78   2 Replies

2goodgabe

As a copper wire is heated, its length increases by 0.50. What is the change of the temperature of ...

As a copper wire is heated, its length increases by 0.50. What is the change of the temperature of ...

As a copper wire is heated, its length increases by 0.50. What is the change of the temperature of the wire? (Cu = 16.6  106/C)
 a. 83.0C
  b. 301C
  c. 60.2C
  d. 226C
  e. 377C


[Ques. 2][/

2goodgabe   54   2 Replies

2goodgabe

As a gust of wind blows across a field of grain, a wave can be seen to move across the field as the ...

As a gust of wind blows across a field of grain, a wave can be seen to move across the field as the ...

As a gust of wind blows across a field of grain, a wave can be seen to move across the field as the tops of the plants sway back and forth. This wave is a:
 a. transverse wave.
  b. longitudinal wave.
  c. polarized wave.
  d. in

2goodgabe   44   2 Replies

2goodgabe