Answer:
she need to use 20 cm thick
Explanation:
given data
wants the attic insulated = R-30
purchased = 10 cm thick
solution
as per given we can say that
10 cm is for the R 15
but she want for R 30
so
R 30 thickness =
R 30 thickness = 20 cm
so she need to use 20 cm thick
If a gun is sighted to hit targets that are at the same height as the gun and 85 m away at the same height, how low, as a positive number in meters, will the bullet hit if aimed directly at a target 180 m away
The muzzle velocity of the bullet is 275 m/s
Answer:
y = -1.1109 m
Explanation:
Range =
range = 85 m
velocity = 275 m/s
g = 9.8 m/s²
If the bullet is aimed at a target 180 m, time required to travel 180 m with horizontal component will be;
t = 0.6546 sec
To determine, how low as a positive number in meters.
y =
y = 0.9909 - 2.1018
y = -1.1109 m
Sorry if you get this wrong but I believe it’s C because without inertia.. particles will fall apart because inertia keeps everything together in the same motion
Answer:
The toy's energy is 18 J.
Explanation:
We have, a 4 kg toy is lifted off the ground and falls at 3 m/s. It is required to find toy's energy.
The toy will have kinetic energy due to its motion. The energy is given by :
So, the toy's energy is 18 J.
Answer: Radiation
Explanation:
Radiation refers to the transfer of heat from one source to another material. The transfer of heat energy from the sun to the earth is called radiation. The grilling of the hamburgers is an example of the radiation as in grilling no direct heat is involved instead the radiations or flames beneath the grilling barbeque burn or grill the hamburgers. Fumes or flames of a charcoal transfer radiations to the grilling hamburgers.