Bài tập toán cơ bản số 42

Created by T. Madas
Question 47
Rearrange the following formulae for the variable written inside the square bracket.

a) v = u + at [a ]

(*)

a=

v −u
t

b) y = 2 x + 3 [ x]

(*)

x=

y −3
2

c) y = bt − 3 [t ]

(*)

t=

y+3
b

d) A = π r 2 [r ]

(*)

r=±

e) v 2 = u 2 + 2as [u ]

(*)

u = ± v 2 − 2as

(*+)

Q=

T −P
7

(*+)

Q=

R−X
T

h) F = Mr 3 [ M ]

(*+)

M=

i) V = Bx3 [ x]

(*+)

r=3

f)

P = T − 7Q [Q]

g) X = R − QT

[Q]

Created by T. Madas

A

π

F
r3
V
B


Created by T. Madas
Question 48

Rearrange the following formulae for the variable written inside the square bracket.

a) s =

v
[t ]
t

(*+)

t=

b) h =

V
mg

[ m]

(*+)

m=

c) A =

xy
2t

[t ]

(*+)

t=

(*+)

t=±

(*+)

m=

4
f) V = π r 3 [r ]
3

(**)

r=3

1
g) V = π r 2h [r ]
3

(**)

r=±

3V
πh

(**)

x=±

4E
3

(**+)

x=

1
d) s = at 2 [t ]
2

e) E =

h) E =

1 2
mv [m]
2

3 2
x [ x]
4

i) T = λ

x
a

[ x]

Created by T. Madas

v
s
v
gh

xy
2A
2S
a

2E
v2
3V
4π

Ta

λ