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8. (ii) If p=–10, find the value of p^2–2p–100.
10
Oct
8. (ii) If p=–10, find the value of p^2–2p–100. 8. (ii) If p=–10 find the value of p^2–2p–100. October 10, 2020 Category: Chapter 13 - Exponents and Powers , Maths , NCERT Class 7 ,
A 0.05 m cube has its upper face displaced by 0.2 cm by a tangential force of 8 N, Calculate the shearing strain, shearing stress and modulus of rigidity of the material of the cube.
10
Oct
A 0.05 m cube has its upper face displaced by 0.2 cm by a tangential force of 8 N, Calculate the shearing strain, shearing stress and modulus of rigidity of the material of the cube. A 0.05 m cube has its upper face displaced by 0.2 cm by a tangential force of 8 N Calculate [...]
8. (i) If z=10, find the value of z^3–3(z–10).
10
Oct
8. (i) If z=10, find the value of z^3–3(z–10). 8. (i) If z=10 find the value of z^3–3(z–10). October 10, 2020 Category: Chapter 13 - Exponents and Powers , Maths , NCERT Class 7 ,
7.Simplify these expressions and find their values if x=3,a=–1,b=–2: (v) 2a–2b–4–5+a
10
Oct
7.Simplify these expressions and find their values if x=3,a=–1,b=–2: (v) 2a–2b–4–5+a 7.Simplify these expressions and find their values if x=3 a=–1 b=–2: (v) 2a–2b–4–5+a October 10, 2020 Category: Chapter 13 - Exponents and Powers , Maths , NCERT Class 7 ,
Two Steel wires of the same length but radii r and 2 r are connected together end to end and tied to a wall as shown. The force stretches the combination by 10 mm. How far does the midpoint A move? (in mm)
10
Oct
Two Steel wires of the same length but radii r and 2 r are connected together end to end and tied to a wall as shown. The force stretches the combination by 10 mm. How far does the midpoint A move? (in mm) Consider a wire of length l cross sectional area A and Young's [...]
7.Simplify these expressions and find their values if x=3,a=–1,b=–2: (iv) 10–3b–4–5b
10
Oct
7.Simplify these expressions and find their values if x=3,a=–1,b=–2: (iv) 10–3b–4–5b 7.Simplify these expressions and find their values if x=3 a=–1 b=–2: (iv) 10–3b–4–5b October 10, 2020 Category: Chapter 13 - Exponents and Powers , Maths , NCERT Class 7 ,
7.Simplify these expressions and find their values if x=3,a=–1,b=–2: (iii) 3a+5–8a+1
10
Oct
7.Simplify these expressions and find their values if x=3,a=–1,b=–2: (iii) 3a+5–8a+1 7.Simplify these expressions and find their values if x=3 a=–1 b=–2: (iii) 3a+5–8a+1 October 10, 2020 Category: Chapter 13 - Exponents and Powers , Maths , NCERT Class 7 ,
The bar shown in the figure is made of a single piece of material. It is fixed at one end. It consists of two segments of equal lengh L/2 each but different cross sectional area A and 2A. Find the ratio of total elongation in the bar to the elongation produced in thicker segment under the action of an axial force F. Consider the shape of the joint to remain circular. (Given :Y is Young’s modulus.
10
Oct
The bar shown in the figure is made of a single piece of material. It is fixed at one end. It consists of two segments of equal lengh L/2 each but different cross sectional area A and 2A. Find the ratio of total elongation in the bar to the elongation produced in thicker segment under [...]
7.Simplify these expressions and find their values if x=3,a=–1,b=–2: (ii) 2–8x+4x+4
10
Oct
7.Simplify these expressions and find their values if x=3,a=–1,b=–2: (ii) 2–8x+4x+4 7.Simplify these expressions and find their values if x=3 a=–1 b=–2: (ii) 2–8x+4x+4 October 10, 2020 Category: Chapter 13 - Exponents and Powers , Maths , NCERT Class 7 ,
A ring of radius r made of wire of density ρ is rotated about a stationary vertical axis passing through its centre and perpendicular to the plane of the ring as shown in the figure. Determine the angular velocity (in rad/s) of ring at which the ring breaks. The wire breaks at tensile stress σ. Ignore gravity. Take σ/ρ = 4 and r = 1 m.
10
Oct
A ring of radius r made of wire of density ρ is rotated about a stationary vertical axis passing through its centre and perpendicular to the plane of the ring as shown in the figure. Determine the angular velocity (in rad/s) of ring at which the ring breaks. The wire breaks at tensile stress σ. [...]