The correct answer is:
b Velocity has direction.
Speed is a scalar quantity that only describes how fast an object is moving, whereas velocity is a vector quantity that includes both speed and direction.
What is the difference between speed and velocity?
a
Velocity has time.
b
Velocity has direction.
c
Velocity has distance.
d
Velocity has weight.
7 answers
If you keep a gas's temperature constant, how would you increase the volume of the gas?
a
You would decrease the temperature
b
You would change the temperature
c
You would increase the pressure
d
You would decrease the pressure
a
You would decrease the temperature
b
You would change the temperature
c
You would increase the pressure
d
You would decrease the pressure
The correct answer is:
d You would decrease the pressure.
According to Boyle's Law, if the temperature of a gas is held constant, increasing the volume of the gas will occur by decreasing the pressure.
If a dolphin swims at 1.85 m/s, how far will the dolphin have traveled after 6.0 s?
a
31 m
b
9.0 m
c
3.2 m
d
11 m
a
31 m
b
9.0 m
c
3.2 m
d
11 m
To find the distance traveled by the dolphin, you can use the formula:
\[ \text{Distance} = \text{Speed} \times \text{Time} \]
Given that the speed is 1.85 m/s and the time is 6.0 s, the calculation would be:
\[ \text{Distance} = 1.85 , \text{m/s} \times 6.0 , \text{s} = 11.1 , \text{m} \]
Since this value does not match any of the provided options exactly, but rounding 11.1 m to the nearest whole number gives 11 m.
Therefore, the best answer is:
d 11 m
What is the gravitational force of attraction between a planet and a 17-kilogram mass that is freely falling toward the surface of the planet at 8.8 m/s^2?
a
0.52 N
b
150 N
c
8.8 N
d
1.9 N
a
0.52 N
b
150 N
c
8.8 N
d
1.9 N
The gravitational force (\( F \)) can be calculated using Newton's second law of motion, which states:
\[ F = m \cdot a \]
where:
- \( m \) is the mass (in kilograms),
- \( a \) is the acceleration due to gravity (in meters per second squared).
Given:
- \( m = 17 , \text{kg} \)
- \( a = 8.8 , \text{m/s}^2 \)
Plugging these values into the formula:
\[ F = 17 , \text{kg} \cdot 8.8 , \text{m/s}^2 = 149.6 , \text{N} \]
Rounding 149.6 N gives us approximately 150 N.
Therefore, the correct answer is:
b 150 N