266629
A force \(\vec{F}\) is acting on a particle of position vector \(\vec{r}\), the torque will be
1 \(\vec{r} \times \vec{F}\)
2 \(\vec{F} \times \vec{r}\)
3 rF
4 \(\frac{\vec{F}}{\vec{r}}\)
Explanation:
a
**NCERT XI-I-106**
TEST SERIES (PHYSICS FST)
266630
A ball of mass \(\mathbf{1 \mathrm { kg }}\) hangs in equilibrium from two strings \(O A\) and \(O B\) as shown in figure. What are the tensions in strings OA and OB ? (Take \(\mathrm{g}=10\) \(\mathrm{ms}^{-2}\) )
266631
The temperature of a piece of metal is increased from \(27^{\circ} \mathrm{C}\) to \(84^{\circ} \mathrm{C}\). The rate at which energy is radiated is increased to
1 Four times
2 Twotimes
3 Six times
4 Eight times
Explanation:
b \[ \begin{aligned} & \frac{\mathrm{E}_2}{\mathrm{E}_1}=\left(\frac{\mathrm{T}_2}{\mathrm{~T}_1}\right)^4 \\ & =\left(\frac{273+84}{273+27}\right)^4=\left(\frac{357}{300}\right)^4=2.0 \end{aligned} \]
**NCERT XI-II 219**
TEST SERIES (PHYSICS FST)
266632
The heat produced by a 100 W heater in 2 minute is equal to:
266629
A force \(\vec{F}\) is acting on a particle of position vector \(\vec{r}\), the torque will be
1 \(\vec{r} \times \vec{F}\)
2 \(\vec{F} \times \vec{r}\)
3 rF
4 \(\frac{\vec{F}}{\vec{r}}\)
Explanation:
a
**NCERT XI-I-106**
TEST SERIES (PHYSICS FST)
266630
A ball of mass \(\mathbf{1 \mathrm { kg }}\) hangs in equilibrium from two strings \(O A\) and \(O B\) as shown in figure. What are the tensions in strings OA and OB ? (Take \(\mathrm{g}=10\) \(\mathrm{ms}^{-2}\) )
266631
The temperature of a piece of metal is increased from \(27^{\circ} \mathrm{C}\) to \(84^{\circ} \mathrm{C}\). The rate at which energy is radiated is increased to
1 Four times
2 Twotimes
3 Six times
4 Eight times
Explanation:
b \[ \begin{aligned} & \frac{\mathrm{E}_2}{\mathrm{E}_1}=\left(\frac{\mathrm{T}_2}{\mathrm{~T}_1}\right)^4 \\ & =\left(\frac{273+84}{273+27}\right)^4=\left(\frac{357}{300}\right)^4=2.0 \end{aligned} \]
**NCERT XI-II 219**
TEST SERIES (PHYSICS FST)
266632
The heat produced by a 100 W heater in 2 minute is equal to:
266629
A force \(\vec{F}\) is acting on a particle of position vector \(\vec{r}\), the torque will be
1 \(\vec{r} \times \vec{F}\)
2 \(\vec{F} \times \vec{r}\)
3 rF
4 \(\frac{\vec{F}}{\vec{r}}\)
Explanation:
a
**NCERT XI-I-106**
TEST SERIES (PHYSICS FST)
266630
A ball of mass \(\mathbf{1 \mathrm { kg }}\) hangs in equilibrium from two strings \(O A\) and \(O B\) as shown in figure. What are the tensions in strings OA and OB ? (Take \(\mathrm{g}=10\) \(\mathrm{ms}^{-2}\) )
266631
The temperature of a piece of metal is increased from \(27^{\circ} \mathrm{C}\) to \(84^{\circ} \mathrm{C}\). The rate at which energy is radiated is increased to
1 Four times
2 Twotimes
3 Six times
4 Eight times
Explanation:
b \[ \begin{aligned} & \frac{\mathrm{E}_2}{\mathrm{E}_1}=\left(\frac{\mathrm{T}_2}{\mathrm{~T}_1}\right)^4 \\ & =\left(\frac{273+84}{273+27}\right)^4=\left(\frac{357}{300}\right)^4=2.0 \end{aligned} \]
**NCERT XI-II 219**
TEST SERIES (PHYSICS FST)
266632
The heat produced by a 100 W heater in 2 minute is equal to:
266629
A force \(\vec{F}\) is acting on a particle of position vector \(\vec{r}\), the torque will be
1 \(\vec{r} \times \vec{F}\)
2 \(\vec{F} \times \vec{r}\)
3 rF
4 \(\frac{\vec{F}}{\vec{r}}\)
Explanation:
a
**NCERT XI-I-106**
TEST SERIES (PHYSICS FST)
266630
A ball of mass \(\mathbf{1 \mathrm { kg }}\) hangs in equilibrium from two strings \(O A\) and \(O B\) as shown in figure. What are the tensions in strings OA and OB ? (Take \(\mathrm{g}=10\) \(\mathrm{ms}^{-2}\) )
266631
The temperature of a piece of metal is increased from \(27^{\circ} \mathrm{C}\) to \(84^{\circ} \mathrm{C}\). The rate at which energy is radiated is increased to
1 Four times
2 Twotimes
3 Six times
4 Eight times
Explanation:
b \[ \begin{aligned} & \frac{\mathrm{E}_2}{\mathrm{E}_1}=\left(\frac{\mathrm{T}_2}{\mathrm{~T}_1}\right)^4 \\ & =\left(\frac{273+84}{273+27}\right)^4=\left(\frac{357}{300}\right)^4=2.0 \end{aligned} \]
**NCERT XI-II 219**
TEST SERIES (PHYSICS FST)
266632
The heat produced by a 100 W heater in 2 minute is equal to:
