Answer:
1.89 m
Explanation:
h = 2 m
u = 3 m/s
θ = 45
Let t be the time taken
use second equation of motion in vertical direction
h = u t + 1/2 a t^2
- 2 = 3 Sin 45 t - 1/2 x 9.8 x t^2
- 2 = 2.12 t - 4.9 t^2
4.9 t^2 - 2.12 t - 2 = 0
By solving we get
t = 0.89 sec
Let x be the horizontal distance travelled
x = u Cos 45 x t
x = 3 Cos 45 x 0.89 = 1.89 m
The answer is 21142 Joules hope this helped cause im sorry if this didnt
Answer:
B
Explanation:
momentum = mass (kg) x velocity (m/s²)
Answer: mass for Pyrex glass 84.21g
mass for sand 61.6g
mass for ethanol 41.32g
mass for water 62.07g
Explanation
By definition specific heat is the amount of heat required to change the temperature of 1 kg mas by 1°C
Q=mcΔT is formula for specific heat
Q is heat transfer
m is mass
ΔT is change in temperature
c is specific heat
c of Pyrex glass= 0.75 j/g°C
c of sand = 0.84 j/g°C
c of ethanol= 2.42 j/g°C
c of water = 4.18 j/g°C
now we will make M(mass) the subject, so equation becomes
m=Q/cΔT
for
pyrex glass T<em>f=</em>55.4°C
m=1920/(55.4-25)*0.75
m=84.21g {after cutting J(joules) and °C we are left with g(grams)}
for
sand T<em>f</em>=62.1°C
m=1920/(62.1-25)*0.84
m=61.6g {after cutting J(joules) and °C we are left with g(grams)}
for
ethanol T<em>f</em>=44.2°C
m=1920/(44.2-25)*2.42
m=41.32g {after cutting J(joules) and °C we are left with g(grams)}
for
water T<em>f=</em>32.4°
m=1920/(32.4-25)*4.18
m=62.07g {after cutting J(joules) and °C we are left with g(grams)}
i hope you understand the solution, thank you.
