A rocket with a lift-off mass 3.5 × 104 kg is blasted upwards with an initial acceleration of 10 m s-2. Then the initial thrust blast is

Question

A rocket with a lift-off mass 3.5 × 104 kg is blasted upwards with an initial acceleration of 10 m s-2. Then the initial thrust blast is (A) 1.75 × 105 N (B) 7.0 × 105 N (C) 14 .0 × 105 N (D) 3.5 × 105 N

Tardigrade Admin · Accepted Answer

Net upthrust = Weight + Blasted force U = mg + 3.5 × 104 × 10 m s-2 U = 3.5 × 104 × 10 m s-1 + 3.5 × 104 × 10 m s-2 U = 7.0 × 105 N

Q. A rocket with a lift-off mass $3.5 \times 1 0^{4}$ kg is blasted upwards with an initial acceleration of $10 m s^{- 2}$ . Then the initial thrust blast is

$1.75 \times 1 0^{5} N$

$7.0 \times 1 0^{5} N$

$14.0 \times 1 0^{5} N$

$3.5 \times 1 0^{5} N$

Net upthrust = Weight + Blasted force
$U = m g + 3.5 \times 1 0^{4} \times 10 m s^{- 2}$
$U = 3.5 \times 1 0^{4} \times 10 m s^{- 1} + 3.5 \times 1 0^{4} \times 10 m s^{- 2}$
$U = 7.0 \times 1 0^{5} N$

Q. A rocket with a lift-off mass 3.5×104 kg is blasted upwards with an initial acceleration of 10ms−2. Then the initial thrust blast is

1.75×105N

7.0×105N

14.0×105N

3.5×105N