Answer:
They swim at speeds up to 24 km/h (15 mph; 13 kn).
Explanation:
Science 8 - Electromagnetic Spectrum Worksheet
Answer:
1. Electromagnetic spectrum
2. Electromagnetic radiation
3. Radiant energy
4. Infared waves
5. Electricmagnetic radiation or Infared waves
6. Radio waves
7. Gamma rays
8. Radio waves
9. Ultraviolet rays
10. This is because it doesn’t contain water or a substance.
11. You should use sunscree and a hat to protect your skin from UV light that might cause skin cancer.
Hope this helps
An archer shot a 0.07 kg arrow at a target. The arrow accelerated at 4,000 m/s2 to reach a speed of 50.0 m/s as it left the bow. During this acceleration, what was the net force on the arrow?
A) 280 N
B) .0000175 N
C) 57,142 N
D) 3.5 N
The net force which has to be applied on the arrow of 0.07kg to accelerate at the rate of 4000m/s² is 280N. Thus, the correct option is A.
What is Force?
A force is an influence which can be a push or a pull that can change the motion of an object. A force can cause an object with some mass to change the velocity, i.e., results into acceleration. A force is a vector quantity as it has both the magnitude and direction.
Force applied on an object can be calculated by the formula:
f = m × a
where, f = force applied,
m = mass of the object,
a = acceleration of the object
Therefore, the force applied on the arrow is:
f = m × a
m = 0.07kg
a = 4000m/s²
f = 0.07 × 4000
f = 280N
Therefore, the correct option is A.
Learn more about Force here:
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While playing hockey in gym class, Timmy is trying to send a plastic puck across the floorand into the goal. Which of the following best describes the forces acting on the plastic puck as it travels across the floor and into to the goal?
A.electromagnetic and gravity
B.gravity and friction
C.mechanical force and friction
D.magnetism and friction
Answer:
C. mechanical force and friction
Explanation:
Timmy's muscles are striking the puck through the stick. The force from the muscles moves the sick, which hits the puck. (EDIT) In addition, the puck is slowed as it travels across the floor, via friction.
Answer:
gravity and friction
Explanation:
Which characteristics belong to Whittaker’s classification system? Select two options.
a.three domains
b.six domains
c.two kingdoms
d.five kingdoms
e.five levels
f.seven levels
g.eight levels
Answer:
Five kingdoms & Seven levels
Explanation:
Robert H. Whittaker proposed five kingdom classical system for living organisms in 1969. These were: Kingdom Monera, Kingdom Protista, Kingdom Fungi, Kingdom Animalia, and Kingdom Plantae. His work was the improvement of earlier work conducted by Carl Linnaeus who proposed three kingdom classification system (Animalia, Plantae, and Protista).
Whittaker's system further categorized each kingdom to seven levels. These were: Kingdom → Phylum → Class → Order → Family → Genus → Species. This categorization was based on similarities in organisms at different levels.
PS: The scientific name of each organism is the combination of genus and family name.
Giving brainliest if you answer correct1!1!1!1!1!
What happens to the atoms of a substance when it burns?
Answer:All the atoms rearrange to form a different substance or different substances
Explanation:An atom is the smallest unit from which a matter can be made.
When the atoms in a substance get heated, the atoms release energy.
The atoms and molecules combine.
So all the atoms rearrange to create a different substance or different substances.