Midterm Exam - Physical Science Srnec
If the speed of an object in circular motion is increased by a factor of 3, by what factor does the centripetal acceleration increase?
9
The Sun's rays are transmitted to Earth by means of ?
radiation
If an object of mass 6.0 kg has an acceleration of 9.0 m/s2, what is the unbalanced force (in Newtons) acting on it?
54
If the lever arm of a 9.0 N force is 6.0 m, what is the torque (in units of Nm) acting on the object due to this force?
54
An object of mass 2.0 kg has a speed of 8.0 m/s and moves a distance of 6.0 m. What is its kinetic energy in joules?
64
What force is required to move a 90.0 kg object in a circle of radius 85.0 m at a constant speed of 8.10 m/s?
69.5
A group of Franciscan biology students drive to Florida to study sharks in the spring semester. Over the course of their 765 mile trip, they maintain an average driving speed of 63.5 miles per hour. How many minutes did their trip take? Do not enter units in your submitted answer.
723
An object has kinetic energy of 324 J. If its speed is 9.0 m/s, what is its mass?
8
What is the density (in units of kg/m3) of an object whose mass is 80,000 grams and volume is 10 m3?
8
Calculate the force (in newtons) on a string tied to a ceiling with a 9.0-kg mass attached.
88
Calculate the centripetal force (in Newtons) on a 3.0 kg object moving in a horizontal circular path of 2.0 x 101 m radius with a speed of 8.0 m/s.
9.6
A 12 N force is applied to the handle of a lawn mower. The angle between the lawn mower handle and the line normal (perpendicular) with the grass is 44 degrees. If the mower is pushed 11 m, calculate the work (in Joules) done pushing the mower.
92
An object with a mass of 5 kg is dropped and takes 9 s to hit the ground. Then another object with a mass of 10 kg is dropped from the same point. How long does it take to hit the ground?
9s
The average adult radiates heat energy at the same rate as
A 100 W light bulb
A freely falling object has a constant acceleration of 9.8 m/s2. This means that .
the object's speed increases by 9.8 m/s each second
The variable r that appears in the equation F = Gm1m2/r2 is?
the straight-line distance between the centers of the two masses.
A ________ must be exerted on an object to change the angular momentum.
torque
Using the following expression, solve for x. 10x + 2x + 5 = -31
-3
Two equal and opposite forces of 6.0 N act on an object. How many newtons is the net force?
0
An ideal gas is confined to a container with an adjustable volume. If the number of molecules and the temperature are held constant, by what factor will the volume change when the pressure is quintupled?
0.2
Given the quantities a = 9.7 m, b = 4.2 s, c = 69 m/s, what is the value of the quantity d in the following relationship? Do not enter units in your submitted answer. The units work out to be m2/s, but only enter the numeric component of your final answer. d = a3 / (cb2)
0.75
How much heat (in kcal) is necessary to change 10.0 g of ice at -20.0°C into water at 10.0°C?
1
On a winter day the temperature drops from -15°C to -25°C overnight. If a pan sitting outside contains 0.20 kg of ice, how much heat (in kcal) is removed from the ice for this temperature change?
1
A car travels at a constant speed of 95.0 km/h around a circular track with a diameter of 1.00 km. What is the magnitude of the car's centripetal acceleration in units of m/s2?
1.39
A 0.065 kg bullet travels with a velocity of magnitude 9.0 x 10^1 km/h. What is the bullet's linear momentum in SI units?
1.6
Which of the following values possess 3 significant figures? Select all that apply. 100 10.0 0.01 0.101 1.00 x 102 0.01000
10.0, 0.101. 1.00 x 10²
Complete the following mathematical operation and express the final answer with the correct number of significant figures. 3.0127 x 4.1 = ?
12
The number of molecules in a container is quadrupled and the Kelvin temperature quadrupled. The volume remains unchanged. The new pressure will be how many times greater than the original pressure?
16
A stone is dropped from a bridge 15 m above a river. With what speed (in units of m/s) does the stone hit the water?
17
If a person weighs 108 lb on Earth, what is the person's weight (in pounds) on the Moon?
18
How much heat is necessary to change 30 g of water at 10°C into water at 80°C?
2
A 5.00-kg object is lifted from the floor to a shelf. The object's new gravitational potential energy relative to the floor is 102 J. What is the height (in units of m) of the shelf?
2.08
A jogger begins by running 10 miles due north. The jogger then turns and runs 20 miles due east. What is the jogger's displacement from his/her starting position?
20
What is the linear momentum of a 100.0 kg object moving around a 30.00 m circle at a constant speed of 2.200 m/s?
220.0
How much heat is required to melt 3.0 kg of ice at 0.0°C to water at 0.0°C?
240
Two of your classmates, each 82.0 kg, are separated by 4.00 meters. What is the gravitational force of attraction between them in nano-newtons?
28
A golfer hits a ball on a level fairway at an angle of 60° relative to the horizontal, and it lands on the green. Another golfer hits a ball with the same speed but at another angle, and it lands on the green by the other ball. What was the launch angle for the second golfer?
30 degrees
If 780 Joules of heat is added to a system, and the internal energy increases by 450 Joules, how much work is done by the system?
330
Complete the following mathematical operation and express the final answer with the correct number of significant figures. 3.0127 + 1.25 = ?
4.26
Which value correctly expresses the mathematical evaluation of the following exponential terms? 2.25 x 10^3 + 22.3 x 10^2
4.48 x 10³
A ball dropped from the top of a building hits the ground 9 s later. How high is the building (in meters)?
400
A student weighing 2.0 x 10^2 N climbs a flight of stairs 9.0 m high in 4.0 s. What power (in units of Watt) is required to perform this task?
450
A temperature of 250.0 Celsius is equivalent to _______ degrees Fahrenheit.
482.0
A person jogs 1 lap around a circular track with a diameter of 150 m in 1.5 minutes. What was the jogger's average speed in m/s? Do not enter units in your submitted answer.
5.2
A radar pulse returns 4.00 × 10-8 s after it was sent out and reflected by an object. What is the separation distance (in meters) of the radar source and the object?
5.98
A temperature of 260.0 Celsius is equivalent to what in Kelvin?
533.2
Which of the following temperature scales has the smallest unit interval? Celsius Kelvin Fahrenheit Calorie
Fahrenheit
A sample of gas has its number of molecules quadrupled, its Kelvin temperature tripled, and its volume tripled. The new pressure changes by a factor of 3 relative to the original pressure?( true or false)
False
Which of the following are considered earth and space sciences? Geology Chemistry Meteorology Physics Astronomy
Geology, Meteorolgy, Astronomy
A 4-kg object falls vertically a distance of 5 m. Its potential energy has changed by approximately how much?
It has decreased by 200 J.
When a 6-kg object increases its potential energy by 180 J, approximately how has its position changed?
It has risen vertically 3 m.
Which of the following is true regarding the vertical and horizontal components of a projectile's velocity? The projectile's vertical component of the velocity does not change and the horizontal component changes at a constant rate. Both the vertical and horizontal components of the velocity remain constant. Both the vertical and horizontal components of the velocity change at a constant rate. The projectile's vertical component of the velocity changes at a constant rate while the horizontal component remains constant.
The projectile's vertical component of the velocity changes at a constant rate while the horizontal component remains constant.
Which of the following is the correct SI unit for time?
second
Which of the following is true regarding the mass and weight of an object? -The mass of the object on earth differs from the mass of the object on the moon, but their weights are the same. -The weight of the object on earth differs from the weight of the object on the moon, but their masses are the same. -The masses and weights are the same on both the earth and the moon. -The masses and weights are both different on the earth and the moon.
The weight of the object on earth differs from the weight of the object on the moon, but their masses are the same.
In free fall, the acceleration is constant. (True/False)
True
When reporting the result of a measurement, it is essential to report both the numerical value as well as the units to describe the measurement. (true/false)
True
Which of the following senses provide us with the most information about the physical world around us? sight and touch touch and taste sight and hearing smell and taste
sight and hearing
Which of the following describe velocity? Select all that apply. Velocity is a vector quantity The SI unit of velocity is m/s Velocity can never be negative Velocity is a displacement divided by time______
Velocity is a vector quantity The SI unit of velocity is m/s Velocity is a displacement divided by time
In a heat pump, heat is moved from the [a] reservoir to the [b] reservoir.
a - low-temperature b- high-temperature
The constant G that appears in the equation F = Gm1m2/r^2 is .
a universal constant
The 2nd law of thermodynamics states that it is impossible for heat to spontaneously flow from a [a] object to a [b] one.
a. low b. hight
A constant net force acting on an object that is free to move will produce a constant .
acceleration
The rate at which an object's velocity changes with time is called its .
acceleration
Which of the following does an automobile air bag do? -increases the contact time in stopping a person -reduces the impact force in a collision -increases the surface area of the impact force -all of the above
all of the above
The quantity mvr is an object's .
angular momentum
Which of the following is the first step in the scientific method? formulate a hypothesis ask a question communicate results collect data
ask a question
Centripetal means which of the following? center seeking pulls outward constant fast none of these
center seeking
Which of the following is the largest reserve of energy in the United States? oil natural gas coal nuclear
coal
An object in uniform circular motion has which of the following?
constant speed
A home fireplace loses the majority of heat up the chimney by which of the following processes?
convection
Heat transfer that involves mass movement is known as ?
convection
The total linear momentum of an isolated system of masses remains the same if there are no ________ unbalanced forces acting on the system.
external
A joule/meter (J/m) is a unit of
force
Work is defined as times distance.
force
The amount of heat necessary to change 1 kg of a solid into a liquid at the same temperature is called the latent heat of .
fusion
An automobile's acceleration may be changed by using the (Select all that apply) gas pedal the steering wheel the horn the brake
gas pedal the steering wheel the brake
Energy provided directly from Earth's interior is called
geothermal energy
An object will sink in a fluid if its average density is __________ than the density of the fluid.
greater
A freely falling object ____________.
has a uniformly increasing velocity
Temperature is a relative measure of ?
hotness an coldness
Which of the following is an acceptable unit of length? inch ampere second foot mile picometer deciliter mole
inch, foot, mile, picometer
For a number expressed in scientific notation, when the decimal is moved to the left, the power of 10 does which of the following?
increases
The natural tendency of an object to remain at rest or in motion with a constant velocity is ?
inertia
Which of the following quantities does a car's speedometer report? average speed average velocity instantaneous speed instantaneous velocity
instantaneous speed
The SI unit of heat is the .
joule
The ______ energy of a pendulum is greatest at the bottom of its swing.
kinetic
The magnitude of a displacement is always the magnitude of the distance traveled.
less than or equal to
When a material is found to have a definite volume but no definite shape, and when it assumes the shape of the container in which it is placed, what is the phase of the material?
liquid
The acceleration produced by an unbalanced force acting on an object is inversely proportional to the object's _____.
mass
_____ energy is defined as the sum of kinetic and potential energies.
mechanical
When a force is applied to an object, work is only done when the object is in _______ .
motion
An object is in motion when it undergoes a continuous change in ?
position
The energy that an object possesses by virtue of its position is known as ______ energy.
protential
The amount of heat necessary to change the temperature of 1 kg of a substance 1°C is the heat.
specific
Which of the following are scalar quantities? acceleration speed density temperature velocity displacement
speed density temperature
When you push on a stationary object on a horizontal surface and it doesn't move, what force is likely opposing your efforts?
static friction
A change in phase takes place at a constant .
temperature
The average kinetic energy of the molecules in a gas is a measure of .
temperature
Which of the following is the correct prefix for an exponential power of 1012? tera femto giga exa
tera
Newton's law of gravitation is believed to be applicable everywhere in the _______.
universe
