Physics

What type of scan is used to find the areas of the body where glucose metabolism

What type of scan is used to find the areas of the body where glucose metabolism

What type of scan is used to find the areas of the body where glucose metabolism is most intense?
A) PET scans
B) CT scans
C) MRI
D) radioactive iodine tracers

ppk   1079   1 Reply

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The weakest of the four fundamental forces is

The weakest of the four fundamental forces is

The weakest of the four fundamental forces is
A) the weak nuclear force.
B) the electromagnetic force.
C) the gravitational force.
D) the strong nuclear force.

ppk   905   1 Reply

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Elementary particles that experience the weak nuclear force but not the strong f

Elementary particles that experience the weak nuclear force but not the strong f

Elementary particles that experience the weak nuclear force but not the strong force are called
A) leptons.
B) hadrons.
C) mesons.
D) bosons.
E) baryons.

ppk   962   1 Reply

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One of the particle groups listed below includes two other groups on the list. W

One of the particle groups listed below includes two other groups on the list. W

One of the particle groups listed below includes two other groups on the list. Which group is it?
A) leptons
B) hadrons
C) mesons
D) bosons.
E) baryons

ppk   1001   1 Reply

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Composite particles that are composed of two quarks are called

Composite particles that are composed of two quarks are called

Composite particles that are composed of two quarks are called
A) leptons.
B) hadrons.
C) mesons.
D) bosons.
E) baryons.

ppk   859   1 Reply

star

Composite particles that are composed of three quarks are called

Composite particles that are composed of three quarks are called

Composite particles that are composed of three quarks are called
A) leptons.
B) hadrons.
C) mesons.
D) bosons.
E) baryons.

ppk   1214   1 Reply

star

moon 2x as far from earth>!>!

moon 2x as far from earth>!>!

If the Moon were twice as far away from the Earth as it is currently (more precisely, if the center of the moon were twice as far away from the center of the Earth as it is currently), how would the force of gravity exerted on the Moon by the Earth c

zdaven   808   2 Replies

ejamonepew

Scientists hope that some day they will be able to produce a theory which will c

Scientists hope that some day they will be able to produce a theory which will c

Scientists hope that some day they will be able to produce a theory which will combine the strong force, the weak nuclear force, and electromagnetism. This theory has been called
A) The Grand Unified Theory.
B) The Theory of Everything.

ppk   1015   1 Reply

bio_man

Rutherfordium-261 has a half-life of 1.08 min. What is the decay constant of rut

Rutherfordium-261 has a half-life of 1.08 min. What is the decay constant of rut

Rutherfordium-261 has a half-life of 1.08 min. What is the decay constant of rutherfordium?
A) 0.0107 s-1
B) 0.0154  s-1
C) 1.87  s-1
D) 2.91  s-1
E) 0.344  s-1

ppk   5122   1 Reply

bio_man

Rutherfordium-261 has a half-life of 1.08 min. How long will it take for a sampl

Rutherfordium-261 has a half-life of 1.08 min. How long will it take for a sampl

Rutherfordium-261 has a half-life of 1.08 min. How long will it take for a sample of rutherfordium to lose one-third of its nuclei?
A) 1.02 min
B) 1.62 min
C) 0.63 min
D) 2.70 min
E) 3.24 min

ppk   2918   1 Reply

bio_man

The nuclei of different isotopes of a given element have the same number of

The nuclei of different isotopes of a given element have the same number of

The nuclei of different isotopes of a given element have the same number of
A) protons.
B) neutrons.
C) nucleons.
D) electrons.
E) positrons.

ppk   923   1 Reply

duzzy

In beta minus decay, the number of neutrons in the nucleus is

In beta minus decay, the number of neutrons in the nucleus is

In beta minus decay, the number of neutrons in the nucleus is
A) decreased by 1.
B) decreased by 2.
C) increased by 1.
D) increased by 2.
E) remains unchanged.

ppk   1115   1 Reply

chemb

In beta minus decay, the number of protons in the nucleus is

In beta minus decay, the number of protons in the nucleus is

In beta minus decay, the number of protons in the nucleus is
A) decreased by 1.
B) decreased by 2.
C) increased by 1.
D) increased by 2.
E) remains unchanged.

ppk   2129   1 Reply

chemb

The number of radioactive nuclei in a particular sample decreases to one-eighth

The number of radioactive nuclei in a particular sample decreases to one-eighth

The number of radioactive nuclei in a particular sample decreases to one-eighth of its original number in 9 days. What is the half-life of these nuclei?
A) 9/8 days
B) 2 days
C) 3 days
D) 8 days
E) 10 days

ppk   1110   1 Reply

chemb

Carbon-14 has a half-life of 5730 years. A sample of wood has been recovered by

Carbon-14 has a half-life of 5730 years. A sample of wood has been recovered by

Carbon-14 has a half-life of 5730 years. A sample of wood has been recovered by an archaeologist. The sample is sent to a laboratory, where it is determined that the activity of the sample is 0.144 Bq/g. By comparing this activity with the activity o

ppk   1694   1 Reply

chemb

If a 2.0-MeV neutron released in a fission reaction loses half its energy in eac

If a 2.0-MeV neutron released in a fission reaction loses half its energy in eac

If a 2.0-MeV neutron released in a fission reaction loses half its energy in each moderator collision, how may collisions are needed to bring it to (1/25) eV?
A) 6
B) 18
C) 26
D) 30
E) 4

ppk   1139   1 Reply

chemb

If a reactor produces an average power of 1000 MW for a year, how much 235U is u

If a reactor produces an average power of 1000 MW for a year, how much 235U is u

If a reactor produces an average power of 1000 MW for a year, how much 235U is used up assuming 200 MeV are released per fission?
A) 0.35 kg
B) 1.75 kg
C) 384 kg
D) 1.1 × 108 kg
E) 3.3 × 108 kg

ppk   1364   1 Reply

chemb

how to find all free previous ap test

how to find all free previous ap test

how to find all free previous ap test

michaellol   3843   7 Replies

bio_man

If the acceleration of an object is always directed perpendicular to its velocit

If the acceleration of an object is always directed perpendicular to its velocit

If the acceleration of an object is always directed perpendicular to its velocity, then
A) the object is speeding up.
B) the object is slowing down.
C) the object is moving with a constant velocity.
D) the object is turning.

ppk   2320   2 Replies

mathlover

If the velocity versus time graph of an object is a straight line making an angl

If the velocity versus time graph of an object is a straight line making an angl

If the velocity versus time graph of an object is a straight line making an angle of 30 degrees with the time axis, the object is
A) moving with constant non-zero speed.
B) moving with constant non-zero acceleration.
C) at rest.
D

ppk   1875   2 Replies

mathlover

Classify the given types of matter as either baryonic or nonbaryonic.

Classify the given types of matter as either baryonic or nonbaryonic.

- dark matter consisting of weakly interacting subatomic particles.
- matter that probably makes up the majority of dark matter
- matter in stars
- matter in brown dwarfs
- matter in our bodies
- dark matter consisting of Jup

saurabh10   2570   1 Reply

how_mendel

Which statement below about the distance between the starting and ending positio

Which statement below about the distance between the starting and ending positio

Which statement below about the distance between the starting and ending positions and the displacement between the starting and ending positions is correct?
A) The distance between the starting and ending positions is twice the magnitude of the

ppk   3379   1 Reply

chemb

Suppose that an object travels from one point in space to another. Make a compa

Suppose that an object travels from one point in space to another. Make a compa

Suppose that an object travels from one point in space to another.  Make a comparison between the displacement and the distance traveled.
A) The displacement is either greater than or equal to the distance traveled.
B) The displacement

ppk   2212   1 Reply

chemb

A stone is thrown straight up. What is its acceleration on the way up?

A stone is thrown straight up. What is its acceleration on the way up?

A stone is thrown straight up. What is its acceleration on the way up?

ppk   2099   1 Reply

chemb

Car A is traveling at twice the speed of car B. They both hit the brakes at the

Car A is traveling at twice the speed of car B. They both hit the brakes at the

Car A is traveling at twice the speed of car B. They both hit the brakes at the same time and undergo identical decelerations. How does the distance required for car A to stop compare with that for car B?

ppk   1762   1 Reply

chemb

An object is moving with constant non-zero acceleration in the +x-axis. The pos

An object is moving with constant non-zero acceleration in the +x-axis. The pos

An object is moving with constant non-zero acceleration in the +x-axis.  The position versus time graph of this object is
A) a horizontal straight line.
B) a vertical straight line.
C) a straight line making an angle with the time

ppk   2329   1 Reply

chemb

An object is moving with constant non-zero velocity in the +x-axis. The velocit

An object is moving with constant non-zero velocity in the +x-axis. The velocit

An object is moving with constant non-zero velocity in the +x-axis.  The velocity versus time graph of this object is
A) a horizontal straight line.
B) a vertical straight line.
C) a straight line making an angle with the time axi

ppk   1062   1 Reply

chemb

If the position versus time graph of an object is a horizontal line, the object

If the position versus time graph of an object is a horizontal line, the object

If the position versus time graph of an object is a horizontal line, the object is
A) moving with constant non-zero speed.
B) moving with constant non-zero acceleration.
C) at rest.
D) moving with infinite speed.
E) none of t

ppk   1413   1 Reply

chemb

The area under a curve in a velocity versus time graph gives

The area under a curve in a velocity versus time graph gives

The area under a curve in a velocity versus time graph gives
A) distance traveled.
B) displacement.
C) speed.
D) velocity.
E) acceleration.

ppk   2147   1 Reply

chemb

A student adds two displacement vectors that have the magnitudes of 12.0 m and

A student adds two displacement vectors that have the magnitudes of 12.0 m and

A student adds two displacement vectors that have the magnitudes of  12.0 m and  5.0 m. What is the range of possible answers for the magnitude of the resultant vector?

ppk   1329   1 Reply

chemb

Which of the following is a scalar quantity?

Which of the following is a scalar quantity?

Which of the following is a scalar quantity?
A) velocity
B) acceleration
C) displacement
D) mass
E) force

ppk   7137   1 Reply

chemb

Which of the following is a vector quantity?

Which of the following is a vector quantity?

Which of the following is a vector quantity?
A) time
B) mass
C) volume
D) displacement
E) speed

ppk   3304   1 Reply

chemb

Which of the following statements is a true statement?

Which of the following statements is a true statement?

Which of the following statements is a true statement?
A) A vector can have positive or negative magnitudes.
B) A vector's magnitude cannot be more than the magnitude of one of its components.
C) A vector's magnitude cannot b

ppk   2359   1 Reply

chemb

You are trying to cross a river that flows due south with a strong current. You

You are trying to cross a river that flows due south with a strong current. You

You are trying to cross a river that flows due south with a strong current.  You start out in your motorboat on the  east bank desiring to reach the  west bank directly  west from your starting point.  You should head your mo

ppk   2894   1 Reply

chemb

A boat, whose speed in still water is 1.75 m/s, must aim upstream at an angle of

A boat, whose speed in still water is 1.75 m/s, must aim upstream at an angle of

A boat, whose speed in still water is 1.75 m/s, must aim upstream at an angle of 26.3° (with respect to a line perpendicular to the shore) in order to travel directly across the stream.
(a) Determine the speed of the current.
(b) Determine

ppk   2797   1 Reply

chemb

A vector is located in the x-y plane. The x- and y-components of this vector are

A vector is located in the x-y plane. The x- and y-components of this vector are

A vector is located in the x-y plane. The x- and y-components of this vector are 4.00 m and 3.00 m, respectively. Find the angle that this vector makes with the positive y-axis.
A) 53.1°
B) 36.9°
C) 126.9°
D) 22.4°
E) 48.6°

ppk   2932   1 Reply

chemb

If the velocity versus time graph of an object is a horizontal line, the object

If the velocity versus time graph of an object is a horizontal line, the object

If the velocity versus time graph of an object is a horizontal line, the object is
A) moving with constant non-zero speed.
B) moving with constant non-zero acceleration.
C) at rest.
D) moving with infinite speed.
E) none of t

ppk   3482   2 Replies

chemb

An object is moving with constant non-zero velocity in the +x-axis. The positio

An object is moving with constant non-zero velocity in the +x-axis. The positio

An object is moving with constant non-zero velocity in the +x-axis.  The position versus time graph of this object is
A) a horizontal straight line.
B) a vertical straight line.
C) a straight line making an angle with the time axi

ppk   1506   2 Replies

chemb

A boy jumps at a speed of 20.0 m/s at an angle of 25.0° above the horizontal. Wh

A boy jumps at a speed of 20.0 m/s at an angle of 25.0° above the horizontal. Wh

A boy jumps at a speed of 20.0 m/s at an angle of 25.0° above the horizontal. What is the horizontal component of the boy's velocity?
A) 18.1 m/s
B) 15.6 m/s
C) 8.45 m/s
D) 12.6 m/s
E) 9.33 m/s

ppk   9178   2 Replies

chemb

Three vectors have equal magnitudes and make 120° with each other. We can say th

Three vectors have equal magnitudes and make 120° with each other. We can say th

Three vectors have equal magnitudes and make 120° with each other. We can say that
A) the magnitude of the resultant is one-third the magnitude of the component vectors.
B) the magnitude of the resultant is three times the magnitude of the

ppk   2390   2 Replies

chemb