There are two vertical and two horizontal forces acting upon an object. Neglecting friction what is the net force of the object.
What is the average acceleration of the object during the first four seconds?
The graph represents a car. What is the average speed of the car.
60 km/ hr
A person places a metal spoon that is at room temperature into a bowl of hot soup. How will the thermal energies of the spoon and the soup be affected?
The spoon will increase in thermal energy, and the soup will decrease in thermal energy.
Both the spoon and the soup will increase in thermal energy.
The spoon will decrease in thermal energy, and the soup will increase in thermal energy.
Both the spoon and the soup will decrease in thermal energy.
Which is the lowest point of a transverse wave?
An object has a mass of 12.8 kg and a velocity of 8.4 m s. What is the kinetic energy of the object?
How much potential energy does a 55-kg person gain when she walks to the top of a hill 20 m tall?
Which statement best explains why there could be a force of attraction between two electrically charged objects?
because they have like charges
because they have unlike charges
because they have the same number of protons
because they have the same number of electrons
Why does a flat piece of notebook paper take longer to reach the ground than an identical piece of notebook paper crumpled into a ball?
The flat piece of paper has more mass.
The crumpled piece of paper has more mass.
The frictional force of air has more effect on the falling flat piece of paper.
The frictional force of air has more effect on the falling crumpled piece of paper .
Why does the weight of an object change with increasing elevation on Earth?
The mass of the object decreases with higher elevation.
The force of gravity acting on the object increases with higher elevation.
The force of gravity acting on the object decreases with higher elevation.
The mass of the object increases with higher elevation.
Which type of friction occurs when an eraser is rubbed across a sheet of paper?
Two students pull on the opposite ends of a rope, but neither student is able to move the other. Which statement best explains why neither student is moved?
They each pull on the rope with the same amount of force, so the net force is zero.
They each exert the same amount of friction against the ground, so the net friction is zero.
Their forces are not balanced, but gravity keeps them from moving.
The two students have the same mass.
Which is an example of a mixture?
Which of the following is an example of a situation in which exothermic chemical reactions occur?
Ice cubes melt into water
Boiling pots of water turn into steam
Fireworks explode during a holiday
Pieces if KCl dissolve in water
The weight of a person on Earth is 6 times his or her on the Moon. What type of force is responsible for the person's weight .
Soft drinks consist of a mixture of water, sugar, and flavoring, with carbon dioxide gas bubbled through it. Which of these ingredients would be consider a solvent?
what number should precede h2 in the chemical equation below in order for the equation to be balanced?
_______ H2+N2= 2NH3
By what process does lens focus light? (Hint: To focus, it would need to BEND the light rays.)
Which of the following could be used to convert light energy to electrical energy?
a solar cell
a chemical storage battery
rotating coils in a magnetic field
Carbon atoms can link themselves together into long chains and rings to form a vast number of highly complicated molecules. Which of the following statements BEST explains why carbon atoms behave this way?
They easily form ionic bonds w/ each other.
They easily form covalent bonds w/ each other.
They easily combine w/ atoms of oxygen.
They easily become highly charged ions.
Which of the following situations violates the law conservation of energy?
A ball dropped from the top of a building increases in speed until it hits the ground.
A block sliding freely on level ice increases in speed until it hits a wall
A child playing on a swing moves fastest at the bottom of the swing's path.
Which of the following pairs are isotopes of the same element?
atom j (27 protons, 32 neutrons) and atom L (27 protons, 33 neutrons)
atom Q (56 protons , 81 neutrons) and atom R (57 protons , 81 neutrons)
atom V (8 protons , 8 neutrons) and atom W (7 protons, 8 neutrons)
atom S (17 protons, 18 neutrons) and atom T (18 protons, 17 neutrons)
Four pairs of objects have the masses given in the choices below. If the objects in each pair are the same distance apart, the gravitational force between the objects in which pair is greatest?
1 kg and 1 kg
1 kg, and 2 kg
2 kg and 1 kg
2 kg and 2kg
In order to determine the speed of an object, what measurements are made?
distance and direction
distance and mass
time , distance, and volume
distance and time
Albert stirs a mug of hot chocolate w/ a metal spoon. What type of heat transfer is responsible for the spoon getting hot?
The number of protons is in a neutral atom is equal to the number of
An ionic bond typically forms between certain types of elements. Which pair of elements will form an ionic compound?
Na and Cu
K and Cl
Ne and O
Li and Mg
Which of the following is a chemical property?
violet is a gas
reacts w/ starch to give a dark blue color
a solid in room temperature