Answer:
0.641 seconds
Explanation:
Distance (d) = 1.0 km
Using the relation :
Speed = distance / time
Time = distance / speed
Speed of sound in seawater is about 1560 m/s
Distance = 1.0km =
1km = 1000m
Time = 1000 / 1560
Time = 0.6410256
Time = 0.641 s
A crate of books is dragged horizontally across a rought floor at a constant
velocity. If the normal force acting on the crate is 66 Newtons, determine the
mass of the crate.
Answer:
m = 6.73 kg
Explanation:
Given that,
The normal force acting on the crate = 66 N
We need to find the mass of the crate.
Normal force = weight of the crate
N = mg
m is mass of the crate
[tex]m=\dfrac{N}{g}\\\\m=\dfrac{66}{9.8}\\\\m=6.73\ kg[/tex]
So, the mass of the carte is 6.73 kg.
Why is the line on the Distance-Time graph
curved, but straight on the Speed-Time?
Answer:
because the distance increased while the speed stayed the same
Explanation:
Answer: A curved line on a distance time graph tell us that the speed is changing but the object is either getting faster or the accelerating or slowing down the decelerating.
Explanation: Hope this helps
All objects _
energy.
Answer:
Explanation:
All objects radiate energy.
Are certain forms or methods of weathering more common in certain environments? For example, where do you think
you'd see exfoliation or ice wedging occur more commonly?
Answer:
Yes
Explanation:
Certain types of weathering are more common in certain environments than others.
This is very true.
Weathering is the physical disintegration and chemical decomposition of rocks to form sediments and soils. Different forms of weathering are dictated by their geographies on the earth surface. Ice or frost wedging is only possible in temperate or polar regions of the world. Exfoliation is pronounced around the tropical region as series of thermal expansion and contraction is involved. Alternate freezing and thawing which expands cracks is also a geographical phenomenon.What would the acceleration be for a car at a stop light that
speeds up in the North direction to 20 m's in 10 s?
HELP PLA
Answer:
a = 2 m/s^2
Explanation:
the solution is already done for you. Its just whats 20 divided by 10 which is 2.
A car is traveling at a constant speed of 60km/h but then changes lanes. Even traveling at a constant speed, the car's velocity is changing. Explain
Answer:
Yes. Anytime the velocity is constant, the acceleration is zero. For example, a car traveling at a constant 90 km/h in a straight line has nonzero velocity and zero acceleration.
:)
brainlest plz, i really need it
A girl police light on level ground with a force of 45 N at a 30° angle above the horizontal the girl pulls a sled 7.3 m how much work does she have do
Explanation:
W=Fdcos0
=45×7.3cos30
=284.4J
Evaporation requires the particles to _____ energy.
Answer:
create
release
absorb
destroy
Answer:
Release
Explanation:
The water is heated until
Please I need help with this question (see image).
Show workings where necessary.
Answer:
Qúéßtîóñ : A quantity of pepper soup of mass 800g poured into a plastic container with a tight fitting lid has a temperature of 30oC. The container is then placed in a microwave oven, rated 1200 W and operated for3 minutes.
(i) Calculate the final temperature attained by the soup. (Assuming no heat losses)
Àñßwër : Pt = mc
1200 x 3 x 60 = x 4000 x
= 67.5o
Final temp = 67 . 5o + 30o
= 97.5oC
(ii) Explain why containers with tight-fitting lids are not suitable for use in microwave cooking.
Àñßwër : The molecules of the steam from the content are confined within the container. As the temperature increases the rate of collision of the molecules with walls of the container increases, thus the pressure inside the container increases. If it is tightly fitted, the pressure can make the container burst thus releasing its hot content.
(iii) When the soup is brought out and allowed to cool, a dent was observed on the container. Explain.[ Take specific heat capacity of the soup = 4000 Jkg-1 K-1 ]
Àñßwër: The container will dent because the condensation of the steam in the container will lead to a decrease in pressure in the container making the atmospheric pressure greater than the pressure in the container.
Explanation:
______❤️ hope it helps you ❤️________can someone help me :(
Answer:
Where is the question?
Explanation:
On a hot day, a child drinks all the water in a plastic bottle. She then screws the
cap back tightly on the bottle, so that the bottle contains only air. She throws the
bottle into a wastebasket, where the Sun shines on it. After a while in the Sun's rays,
the air in the bottle is much hotter than before.
cap screwed on
(i) State what has happened to the pressure of the air in the bottle.
Give a reason for your answer.
(ii) In terms of the behaviour of the air molecules, explain your answer
to a(i)
What is an atom? Please helpppppp